Although it's an old French form of
Alice it is not considered the only version of
Alice in French.
Alice is used in
France and
Alix is used on both boys and girls there. You can see it used on a male character in this French/Belgian comic book:
http://en.wikipedia.org/wiki/The_Adventures_of_Alix
The name
Alice was used 155,447 times between 1900 and 2003 in
France while
Alix was used 17,681 times between those years. The stats are taken from the INSEE (Institut National de la Statistique et des Études Économiques).
I prefer the form
Alice but
Alix is very nice as well.