I didn't want to get into the Thor comment here since that seem more suiteable for marvel's thread, but Thor name wasn't originally Thor from what I've read, it's Odinson. It's the hammer that references that you're labeled as Thor once you're found worthy of wielding it. So I think that's the common misconception, people assume Thor was originally his birthname like it's original norse counterpart, when it's not.
I personally have no problem with her being named Thor. I know three people in my same department that shares my name, let alone all the Roberts on my own team, so having two Thor's isn't a big deal really.