In fantastic four who named the heros?

Answer 1

Within the story, the characters name themselves.

In real life, Stan Lee and Jack Kirby co-created the Fantastic Four. Lee said he created a synopsis for the first Fantastic Four story that he gave to penciller Jack Kirby, who then drew the entire story. Kirby turned in his penciled art pages to Lee, who added dialogue and captions. That would seem to suggest that Lee named them, but outside commentators have found it hard to identify with precise detail who is responsible for what.

Mark Evanier, studio assistant to Jack Kirby, says that the considered opinion of Lee and Kirby's contemporaries was "that Fantastic Four was created by Stan and Jack. No further division of credit seemed appropriate."