There are a lot, most just aren't in the UFC, as there are fighters all over the world, along with multiple different Combat Sports. In metropolitan cities, we get a lot of Adult Entertainers, Celebs, etc.. coming in to train and end up finding a love for the training and end up competing. The most attractive Female Fighters I've met aren't known. Now if asking about a certain org or within a certain Combat Sport, then you might get a couple names.