Quote from Phoebe in The One with the Tiny T-Shirt
Phoebe: Hey, why isn't it "Spiderman"? Like Goldman, Silverman? Chandler: Because it's not his last name. Phoebe: It isn't? Chandler: It's not, like, Phil Spiderman. He's a Spider-Man: You know, like, Goldman is a last name. But there's no Gold-Man. Phoebe: Oh, okay. There should be a Gold-Man!