I think our names do have an impact on personalities.
I think people (adults, rather than children) make pre-judgements (even in a subconscious, snap-second way) when they hear our names and very subtly, adjust how they behave to us accordingly.
This might start with nursery/school teachers, friends' parents, teenage/uni friends, employers, colleagues, etc etc.
I have a very unusual, but classical European name, which I love. If pushed, I'd describe myself as outgoing, confident and gregarious. People are always interested in my name, asking about the origins of it, and my origins. Once introduced I've never known anyone to forget my name, even after a couple of decades. In my professional life, I think my name has opened doors, in that it jumps out at people from a list, and sticks in their minds.
I wonder if people would have responded to me in the same way had my name been (random example 'Jane')? And if they hadn't, I do think I might not have been so confident, positive or sociable...
However, I do think nurture and genetics are even bigger factors in determining our personalities - but our names are definitely a significant piece of the jigsaw.
Why else do we spend so much time and energy choosing our childrens' names?!