Ok here goes:
Ugly-sounding old lady names - Ethel, Gertrude, Hilda, Olive.
Anything double barrelled - Jamie-Lee, Carrie-Ann
Anything spelt funny
Anything that is really a boy's name (Jamie) or a surname (Morgan, Madison)
Anything overly "frilly" - Arabella, Georgiana, Mariella, you get the picture.
Names that are too obviously feminised boys' names - Nigella, Thomasina, Roberta, Edwina
Anything too "cutesy" - Poppy, Daisy, Honey, Millie - unless they also have a "proper" birth cert name.
Anything reflecting a particular virtue - Prudence, Patience, Hope.
I quite like what I think of as "bad girl" names - Tallulah, Delilah, Ruby, Roxy - but wouldn't call my child by them
I don't really like most names beginning with O or H (with a few exceptions, eg I do like Hazel and Holly)
Erm... Not sure what that leaves!