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The following is a list of fan names and references found commonly amongst the fandom. Reason for difference or dispute is listed with a short hand guide as to why fans may call it by another name. Some name disputes are just results of a translation such as one made by fan-subs or official dubbing companies like 4Kids. Many of the name variants are results of varying degrees of false etymology amongst translations.
Straw Hat Pirates
- Monkey D. Lufi
- Monkey D. Luefy
- Monkey D. Rufy
- Monkey D. Rufi - "Rufi" was an early commonly recorded version of his name before Oda confirmed it was intended to be "Luffy". This name appeared even in Japan, as well as many other language translations across the world. It can be considered one of the very first incorrect versions of any character name and one of the first names to be corrected by Oda. However, there are still a number of fans in the English speaking fandom (particularly those who do not speak English as a first language) who use "Rufi."
- Lolonoa Zoro
- Roronoa Zolo - The name of Zoro in the 4Kids and edited FUNimation dubs and chapter 50 onwards of the Viz Manga. Often disputed as to either version of the name as to which should be used. Even in Japan, "Zolo" is sometimes used instead of "Zoro";  despite Oda having explicitly spelled out his name.
- Roronoa Zorro - Some older scanlations used this spelling.
- Roranaro Zoro - used in Odex subs.
- Loronoa Zoro
- Rolonoa Zoro
- Usoppu - Accidentally used in the first version of We Go! before being fixed in a later version.
- Liar Bo - A spelling found in some bootleg DVDs.
- Soge King - This name is used in FUNimation's subbed simulcast and many fan translations.
- Sniper King - This name is used in the Viz manga and in the FUNimation dub.
- Soldier King - Used in rare promotional footage from the UK. Not much is known why Soldier King was dubbed instead of Sniper King, but one common theory is this was the planned 4Kids name.
- Sangi - Used in the Singaporean English dub. Odex later correctly wrote his name as Sanji around Season 2.
- Lobin - In an official scan for One Piece: Unlimited Adventure, Robin's name was misspelled as "Lobin". This was corrected in the final product.
Franky (Cutty Flam)
- Flanky - Seen in the Japan-only game Fighting for One Piece.
- Cutty Fran - Possibly the most commonly used incorrect version of Franky's original name, as "Fran" can be used in English as a male's first name (as a diminutive form of Frank or Francis) as opposed to "Flan".
- Brooke - Because the "e" is silent, both "Brook" and "Brooke" are correct ways of spelling it. However, "Brooke" is normally used as the girl's version of the name. It has been confirmed that the e-less version is correct, however it is still common to see "Brooke" being used.
- Merry Go - The name used in the Viz Manga, 4Kids dub, and FUNimation's edited-for-TV dub. This is the direct transliteration from Japanese, and means, "The Merry".
Red Hair Pirates
- Lucky Roo - The name used in One Piece Red: Grand Characters.
- Boogie - Buggy First Name Idea (as seen in volume 2)
These names were used in a few older scanlations. However, Buggy is the correct spelling used in all official materials.
- Kabaji - Romanization of his name in the manga.
Black Cat Pirates
- Captain Black
- Butchie - The name used in English translations.
- Ghin - The spelling used in the dubs, so viewers would not confuse the name with the liquor drink. In English, "Gin" would be pronounced with a soft "g" rather than a hard one.
- Don Creek
- Paloo - Upon introduction
- Juraquille Mihawk - It was often argued over whether "Dracule" or "Juraquille" is the correct spelling of Mihawk's full name. Dracule is used by the 4Kids version of the series and is often scorned because of its link to the dub, but it also appears within the Viz English manga, as well as the FUNimation dub. However, there was no Latin text supporting Juraquille in the Japanese version to be released at the time. Most fans avoided the argument by just calling him "Mihawk". The argument was finally put to an end when Oda confirmed it to be Dracule in Databook #4 "One Piece Green: Secret Pieces"
- Diego Mihawk - Mihawk's name in the Odex dub.
- Delacure Mihawk
- Dulacre Mihawk
- Mihark - Spelled on his character poster for Grand Battle!
- Jracule Mihawk - Displayed in episode 917
- Haj-chan - First romanization of his name, later corrected
- Haji - First romanization of his nickname, later corrected
- Chuu - common amongst Fansubbers. It is how the name "Chew" sounds when spoken by a Japanese person, and is also the Japanese onomatopeoia for the sound of a kiss.
- Choo - The English versions choose this spelling.
- Edward Newcart - The name seen in his infobox
- Portgaz D. Trace - He was renamed in the 4Kids version. Both drinking and gambling references have been noted to be removed by 4Kids from shows they have dubbed in the past. No reason was given, but Ace is the name of an alcoholic drink and also has links to gambling via the four Aces in a deck of cards. Oddly, the name "Ace" has been noted to appear in other dubbed shows by 4Kids. Chances are they did not realize Ace is also a common name, and rather pointless to hide from the younger audience.
- Portgaz D. Ace - His surname was romanized as "Portgaz" in the English manga and FUNimation simulcast subs, however it only appears that way in the Simulcast. On the DVD release of the Alabasta Arc, his name is spoken and written in the subtitles as "Portgas D. Ace".
- Portugues D. Ace - Used in some fan translations, but not a very common spelling.
- Portgus D. Ace
- Puma D. Ace
- Gol D. Ace - His real name
Confimed "Jozu" in Databook #4 "One Piece Green: Secret Pieces"
- Black Mustache Pirates - Original romanization of the crew, but was corrected in their following appearances
- Black Mustache - Original romanization of his alias, but was corrected in his following appearances
- Marshall D. Teech - In some English versions, his name is romanized as "Teech". This includes the FUNimation simulcast, but was later corrected as "Teach".
- G. Zess Burgess - The name used in edited-for-TV dubs, likely to avoid religion.
- Jesus Barges
- Shiryu - This spelling was used until Oda confirmed the official spelling. However, he has also used this spelling. It is also used in the Viz Manga and FUNimation versions.
- Shilliew - Used in chapter 595 , but then later changed back to Shiryu in chapter 925.
- Catalina Devon - The spelling was originally used in the Viz Manga and FUNimation subs until Oda provided the correct spelling.
- Basco Shot
- Abalo Pizarro
- Avaro Pizarro
- Avolo Pizzaro
- Big Bun - Used in the Viz Manga.
- Big Bang
- Rumba Pirates
- Jimbei - In the Viz English manga and FUNimation dub, his name is spelled as Jimbei.
Maelstrom Spider Pirates
New Fishman Pirates
- Hodi Jones
- Hordy Jones
- Icaros Muhhi
- Don Quixote Doflamingo - The name used in the FUNimation dub and Viz manga.
- Don Quichotte Doflamingo
- Don Quichotte de Flamingo
- Mone - The first romanization of her name
- Virgo - The first romanization of his name
- Ceasar Clown
- Caesar Crown - Used in early translations, and appears in every volume after Volume 68.
- Donquixote Rocinante - Used in early translations
- Don Quixote Rocinante - Spelling used by VIZ Manga
- Don Quichotte Rocinante
Big Mom Pirates
Big Mam Pirates - First romanization of the name
- Charlotte Purin
- Charlotte Dogtooth - The name of the flower from which the Katakuriko starch is produced from.
- Charlotte Rinrin - Both versions were romanized in the manga at different times.
- Charlotte Lingling
- Charlotte Baskartte
- Charlotte Bassquarte
- Navy - While the Japanese text provided along side the word Marine means "Navy", most fans argue "Marine" is the correct term since Oda himself has romanized it directly. However few fans seem to realize or understand "Marine" means Navy in French or German and scold the use of Navy due to its ties to the 4Kids dub. The Viz and FUNimation translations avoid this conflict by saying the group is called the "Navy" and the soldiers are "Marines". Oda is renowned for taking words from other languages and quite clearly intended on using Marines. In the English version of the game One Piece: Unlimited Adventure and FUNimation's simulcast, they are translated as "Navy".
- Helmepp - This was Stephen Paul's translation of his name.
- Django - The romanization that Viz and 4Kids used. The "D" is silent.
- Chaser - In the 4Kids dub, Smoker's cigars were removed and his name was changed to "Chaser" in order to avoid reference of the character being a chain-smoker in the original. He keeps his original name in the English manga and uncut FUNimation dub.
- Zango - First romanization of his name in the manga
- Hagawa D. Saulo
- Jaguar D. Saulo
- Haguar D. Sauro
- Hagwor D. Sauro
- Hagwarl D. Saulo
- Hagwar D. Sauro
- Jaguar D. Saulo
In Japanese it's ハグワール・D・サウロ (Haguwāru D Sauro). It is currently unknown what the actual English romanization of his name is. In the English version of Movie 8 and the FUNimation dub his name is translated as Jaguar D. Saul (pronounced "Haguar D. Saul").
- Dr. Hiluluk
- Dr. Bader
- Arabasta - It was long debated whether the proper name was Arabasta or Alabasta. The error was because of the 'R' and 'L' pronunciations, and because of the multiple times Oda spells it both ways. As of Chapter 611, Oda's latest spelling is "Alabasta". All official English versions (excluding the video game mentioned below) use "Alabasta".
- Alabaster - used in the English version of the video game One Piece: Unlimited Adventure. However, in the actual FUNimation dub, it is pronounced "Alabasta".
- Nefeltari Vivi
- Nefertari Bibi
- Nefertari Bebe
- Nefertari BB
- Nefeltari BB
- Nefeltari Nebra - Cobra's name in the 4Kids dub. Some fans believe the reason why his name was changed was to avoid confusion with a character in another 4Kids property, G.I. Joe: Sigma 6. Strangely, his original name "Cobra" was sometimes seen on the closed captions.
- Nefeltari Cobra
- Carue - The most commonly used name
- Kalu - The Odex dub uses this spelling.
- Bunchi - This is the romanization used in the Viz Manga and 4Kids and FUNimation dubs.
- Montblanc Cricket - Spelled this way in the uncut FUNimation dub.
- Monbran Cricket - This is how his name is spelled in the edited FUNimation dub.
- Mombran Cricket - In the 4Kids dub (or One Piece: Pirates Carnival), his family name is written as "Mombran".
- Maron Cricket
- Montblanc Noland - His name is spelled this way in the uncut FUNimation dub.
- Monbran Noland - The spelling used in the edited FUNimation dub.
- Mombran Noland - In the 4Kids dub (or One Piece: Pirates Carnival), his family name is written as "Mombran".
- Monbran Norland
- Montblanck Norland
- Montblanc Norland
- Maron Noland
- Thriller Park
- Thriller Burke - Used by rookie translators
- Thriller Barque
- Before the official name was released, many guesses were made as to the name of the place. It was later confirmed to be dubbed "Thriller Bark".
- Oz - The first translation that came out for his name.
- Odr - Another version of his name, after it was discovered his name is identical to the Norse god, attempts to find the correct translation occurred.
- Odz - The second version of the name to occur, it was considered for a while the "Corrected" version.
- Ohz - Used in the 20th Log Collection.
- Kumacy - Used in the Viz Manga and FUNimation subs.
- Bearsy - Kuma means bear in Japanese. Therefore, some fans refer to him as "Bearsy".
- Belle-Mère - Often it is argued how close to the French word for stepmother Bell-mère's name should be, hence why there are several spellings of her name.
- Bellemere - Used in One Piece Red: Grand Characters.
- Berumeru - Sometimes used by less experienced subbings
- Belmel/Bellemel - Occasionally used in inexperienced subbings and fan scans.
Long Ring Long Land
- Gareera Company - First romanization of its name
- Gorilla Company - Another first translation of its name
- Iceberg - Original but erroneous romanization of his name, a bit later corrected. FUNimation and Viz use this name spelling.
- Tiranosaurus - Original but erroneous romanization of his name, a bit later corrected
- Pauly - Used in the English version of the game Unlimited Adventure. It was also written as "Pauly" in a poll in Weekly Jump, however, as other characters' names were spelled differently than the accepted canon or fan spellings, the spelling "Paulie" is still, by far, the most common spelling used. Others also compare it to how Franky's name was spelled as "Frankie."
- Tyleston - Used in the ADC-Elites fansubbers' subtitles.
Sea Floor/Sabaody Archipelago
- Caymy - Name used in some merchandise.
- Pappagu - Used in the English manga by Viz and the subs by FUNimation. This is basically a literal romanization of his name.
- Genista - Her name in the Viz Manga. This is basically just a translation of her name.
- Peekatha Krotch - VIZ Manga translation.
- Grabba - VIZ spelling of her name.
- Eneru - This is the name used in all official English versions.
- Aum - Used in some older translations.
- Orm - The name appears this way in One Piece Grand Battle 3.
- Emporio Ivancov - In the FUNimation subs, his name was originally spelled "Ivancov". This was changed later on.
- Emporio Iwankov
- Emporio Ivankof
- Hannibal - An incorrect spelling used in earlier scanlations of the Impel Down arc.
- Bon Clay - Mostly seems to come from the anime translators. "Kurei" sounds similar to the English word "clay" when spoken, partly due to the name containing a silent "u" as often is the case with the Japanese language. However in the Japanese game Grand Battle Rush his name is also written as Bon Clay in English text. Though the "clay" part would associate with the abilities of his Mane Mane no Mi, his name keeps with the Baroque Works pattern of naming female agents (which he is due to his okama nature) after holidays. Even the FUNimation sub uses this as a translation.
- Bon Cray
- Bon Kure
Cipher Pol Agents
- Califa - Romanization of her name in the anime
- Fukurouu - First romanization of his name in the manga
- Gekko Moriah - Romanization used in One Piece Green: Secret Pieces
- Avalo Pizaro
- Raftel - The spelling used in all official English versions and nearly all fan material.
- Berry - Name used in all English versions.
- Beli - Common fan translation.
- Mermen - Due to early chapter confusion, sometimes the names of the species are mixed up and Fishmen is translated to Mermen. The original names use the same kanji, but switched.
- Climate Baton - In the English manga adaption by Viz and FUNimation Simulcast subs, the Clima-Tact is called the "Climate Baton". This is because the "Tact" in the name is pronounced "takuto" in Japanese. "Takuto" is the Japanese word for "baton".
- Weather Forcer - The name used in the 4Kids dub. Strangely, in the video games dubbed by 4Kids, Nami's profiles call it by its original name.
- Clima-Takt - Spelling used in the FUNimation dub and DVD subtitles. However, in the game One Piece: Unlimited Adventure, dubbed by FUNimation, the weapon is spelled its original name.
- Ponegliff - The spelling used in the English manga.
- Ponecliff - The spelling used at one point by 4Kids.