:Most authors refer to these cultures as Aurignacian, Gravettian, Solutrean and Magdalenian. The reason is that most authors are concerned with single finds or stratigraphy. Cro-Magnons are neither. From what I can see, those authors that do look at the people and/or the ethnic composition of palaeolithic Europe often use Cro-Magnon (caveat: I'm not an archaeologist, I may not have the full overview of the field). 

 :As for how common the term is, I have answered that with some searches in google schoolar above. I believe that question is only relevant for a discussion of whether we should have an article on Cro-Magnons at all.