Yes. Goku has a second son by the name of Goten. However, he was dead when his son was born, and didn't get a chance to see him until Goten was 7 years old. Goten looks so much like Goku that Goku's first reaction to him was to ask why there was a 'little me' hiding behind Chi-Chi.
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Goku doesn't have a third son. He only has Gohan his first son and Goten his second son.
Goku's second son is named Goten. He is Gohan's younger brother.
nothing is diffrent son is gukus last name that's why they call him son goku.
Yes. "Son" is his last name.
He doesn't have one, but his full name is Son Goku.