most of the girls you named started off as Feature dancers ... so they toured Quebec and Ontario for the most part .. Tangerine for one has featured straight across canada, Japan, France and the US. So an english name was really a professional choice. it's proven to be more effective.
Tangerine dream and Jenny Ryder
Another good example would be Judy Star, she only spoke french till about a year and a half ago, and her career has exploded from it !
Judy Star
www.vidsview.net