Well, since Sam would have been born before the timeline split, he'd still have the same name.
#pedanticasshole
Let's not forget though that the entire timeline would have to been changed going all the way back to the Big Bang. If you go back and alter the past it alters the future that alters future trips back to the past, which means in one case "Voyager" is never sent to the Big Bang by Q or the Temporal Code War didn't happen or it happened differently. That means he could have gotten a different name.
Jason