It is never revealed if he has a last name or not.
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it has never been revealed if Yamcha has a last name or not.
Yamcha and bulma get together right after goku turns into a great ape in i think ....Episode...... 10
Gohan always use the hairstyles that yamcha has before. despite on their similar looks, They're also portrade by the same voice actor Kyle Herbert.
No one, he didn't get another girlfriend after Bulma.
No, a fusion between Goku and Yamcha would probably make Goku weaker. But if they fused while Goku was a kid, it might be pretty cool. Goyam or Yamku or Goya (FAIL) lol.