I personally have never run across an example of a Vendetta, but since I have run across real examples of girls named Jealousy and Tyranny, it wouldn't surprise me. Some parents fall in love with the sound of words which are similar to those of other names and don't consider the meaning. Vendetta sounds enough like
Violetta,
Venetia,
Odetta, etc., that some parent may have thought it was a very "feminine" name for a girl.