Amelia - the sound of it makes me cringe. I cannot stand it.
Also Bree/Bri names grate on me awfully, I can't stand them. Brianna, Briella - eugh. Aubrey's the worst for me, I think. I don't like Audrey either, it's an old lady name to me and doesn't suit a child at all. I don't like overly frilly princessy names either, they just make me think that child's going to be a spoilt brat. And any of the trendy rhyming Aidan names (not Aidan itself though) and the -son/mac- names on girls, both mean son of. And boys names on girls but spelt wrong to look more feminine - eg Elliette. Eugh. Just use Ellie or Charlotte or something, or leave Elliot for a son.
Actually, just thought of my most disliked girls' name - Genevieve. I don't know what it is about it but the jenna-veev pronunciation is horrible to me, I don't find the French way of john-vee-ev as bad though I still don't like it that much.