Hello Yvonne,
I do not thin it is off putting, especially if you get that vibe from your paintings, if you look at one of your ladies and it just really seems that a certain name fits then why not name them? If people don't like it, but they really do like the art work I think they will still buy it, and just ignore the name Or even use it as a talking point about the painting. Also without sounding sexist some men have trouble buying gifts sometimes and well they are possibly more likely to buy a painting if it carries their ladies name, image " I got this beautiful painting for you honey, it was inspired by your beauty and therefore carries your name" I know that is something my Dad would do.
That said I think you could leave one or two without names, make them ladies of mystery and intrigue, You may find them to be even more popular than the ladies with names.