Thread:AlexanderImAlsoGr8/@comment-27020676-20200311112358/@comment-35455760-20200311172830

He said that somewhere in a Q&A in the first volumes of the manga, from what I remember. And with the Monkey family it's more of a Japanese culture issue. Japanese people usually use their surnames first and the author is Japanese, so he does it that way for those characters too, not only pirates. But beside Japan you can put their surnames second, it's okay and still correct.