User blog comment:PossesedChipmunk18/How did Darwin become a Talking Fish?/@comment-4799471-20130712154652/@comment-5588400-20130712160707

There's no real explanation as to how it happened, but yes, he is named after Charles Darwin, the man behind the theory of evolution, or Darwinism. Also, the Darwinism "mascot" is of a fish with legs.