This is just an older French version of
Christine and so means "
Christian".
The surname of the former Prime Minister of Canada,
Jean Chretien, is just the masculine form of the same name.
http://canadaonline.about.com/od/primeminister/p/pmchretien.htm
You can hear how to pronounce it here:
http://forvo.com/word/jeunesse_ouvri%C3%A8re_chr%C3%A9tienne/