Eddie’s surname in English-language Yo-kai Watch media is Archer.
Eddie is the nickname of Edward Archer, one of Nate Adams’s classmates and friends in the localized versions of the franchise. He is usually seen with Bear Bernstein and is characterized as technologically skilled, skeptical of ghosts, and interested in gadgets. His headphones and practical personality help distinguish him from the more openly supernatural members of the cast.
The name is a localization of the Japanese character Kanchi Imada. Yo-kai Watch frequently changes names, jokes, and cultural references when adapting the games and anime for English-speaking audiences. That is why English readers encounter Eddie Archer rather than his original Japanese name.
A common mix-up is confusing Eddie’s surname with those of his classmates: Katie is Katie Forester, while Bear is Barnaby “Bear” Bernstein. Archer is specifically Eddie’s English-language family name, not a description of his role or a reference to a separate character.