What is goku's last name?
His full name is Son Goku, because in Japanese the family name goes before the given name.
He doesn't have a last name, or at least doesn't know what it is.
Dragonball's Goku's last name is Son, taken from his adoptive grandfather, Son Gohan. In Japanese culture, the sur-name comes first, so Gohan and Goku's last name is Son.
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