My older son's name (Seamus) is probably very common in Ireland but hasnt totally taken off in our area yet. He's 12, and we have only one or two other kids with his name. He is always the only "Seamus" in his school or group. He's probably the only Seamus in the city. I think it helps him stand out. His name really suits him (he's got red hair and freckles.
My younger son has a fairly uncommon name, Keegan, but its not what i would call "unusual"....its pretty straightforward, doesnt lend itself to much nicknaming, and is easy to pronounce.
Seamus on the other hand...lots of people want to call him SEE-mus...?? I always have to say "no, Seamus, s.e.a....like SEAN?" but people are still confused. Sometimes he gets called Shane...? Or James...and for awhile some kids in school were calling him Shaman, but he thought that was sort of cool.
ETA: you never know, when you name a child, what names will be popular or not in five, ten, twelve years. My niece and her friend (they were 12 or 13 at the time) were looking through my old high school year book a couple of years ago, and were rolling on the floor laughing at a particularly "weird" name...which was....Renee. Renee?! I went to school with SO many of them, and yet now kids would think that was a "weird" name. But Neavah, or Skylar, or Ella, not so much.