Yes and they became Tiemcha. They are even stronger than Gogeta. I don't know what that guy is saying, but in the manga/anime they never fuse. They only fuse in the games.
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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
It is never revealed if he has a last name or not.
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.