Link wasn't given a last name. I guess the creator didn't want to give him one, or had no ideas. No one knows besides the creator (Shigeru Miyamoto)! However, many have said that since he was raised by the kokiri, his name could lead to being Link of the Kokiri.
My Answer: His last name is In Park If you ever watched the abridged series of majoras mask by Adamwestlapdog
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it has never been revealed if Yamcha has a last name or not.
It is never revealed if he has a last name or not.
waluigi wario is his last name
princess peach last name is toadstool
Ash's last name is Ketchum in Pokémon.