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Ash's last name is Ketchum in Pokémon.
Kechem
if your talking about his favourite pokemon it's pikachu
May's full name on the Pokemon TV show is "May" since she does not have a last name like Ash Ketchum, Ash's Mom, Professor Oak and Gary Oak do.
Nigel Ash's birth name is Nigel Ezekiel Ash.
Russell Ash's birth name is Russell Harvey Ash.
Ryan Ash's birth name is Ryan Gregory Ash.
Ed Ash's birth name is Duane Edward Ash.
Ash Christian's birth name is Ash Ray Christian.
Ralph Ash's birth name is Ralph Walker Ash.
Jerome Ash's birth name is Ash, Jerome Harold.
Ash does not have another name. But for all we know Ash's real name could be Pablo or something :)