User blog comment:Bluefox87/Which is the first name monkey or luffy/@comment-24.235.56.170-20150504170850

His last name is his given name (westerner's first name), so the family name is Monkey D.

Technically speaking, Monkey is his first name because it comes first in his name. (D'uh.) That's where you're having trouble: it's not first name, last name; it's given name, family name. The "first name" is always going to be the first name. But asian naming conventions are done in the reverse of how westerners do it, so that the given name is last, and the family name is first.

Using the term "first name" when talking about asian names is a great way to confuse people.