I prefer
Colette.
Cosette just sounds like a freakish version of
Colette. :-)
I like:
Cosette Adeline - gorgeous!
Cosette AmandineCosette Amélie - gorgeous!
Cosette Béatrix
Cosette Élodie - gorgeous!
Cosette Émilie
Cosette Eulalie -
Cosette Eulalia would be nicer
Cosette Geneviève - gorgeous!
Cosette Madeleine