Personally, I don't see anything wrong with naming a baby something unique or something common. It's a personal choice, and really not anyone else's business. My oldest son's name is in between different and common. His name is Graye. G-R-A-Y-E. Gray is a color, a common color, but it's not an everyday name. I added the e on the end because I liked the way it looked written that way. Because I wanted to, and that's all that matters.
I also have a friend named Rayne. Pronounced just like Rain. Her mom changed the spelling because she thought it would look more like a name. I have a friend named Sean. Pronounced Shaun. That's a pretty common spelling, but it doesn't look anything like it sounds, does it? Kaitlyn, Caitlyn, Katelin, Catelin, and several others are all different ways to spell one name too. Is only ONE of them correct? Which one?
I think it's pretty rude etiquette-wise to try and foist your own personal opinions off on someone else. Disagree if you like, but is it really your business or place to try and make someone else 'see the light"?