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I'm going to ask a stupid question, but does Ash have a last name in Japanese? He always refers to himself as "Satoshi from Masara Town", and since starting watching the subs/RAWs however long ago I don't think there was an episode where he mentions his last name.
I know in the dub his last name is a pun on Gotta Catch em All, but the Japanese name as far as I can find doesn't exist.