User blog comment:Cdswalkthrough/Vinsmoke Sanji or Just Sanji/@comment-24850639-20180501143856

I still never understood the reasoning as to why his name was ever changed in the first place. I thought we officially went by what the character themselves identify as, not what other elements of the story say they should be called. Lola never considered herself "Charlotte Lola", and thus we dont identify her as that. I'm sure Nami and Usopp have last names too, and there's a good reason why Oda has never had them identify themselves with them. He wants nothing to do with the name or family, let the man just be Sanji.