I think mariej2 was just pointing out that
Renee is the proper feminine form. You could name a girl
Rene, but that doesn't make
Rene a female name.
Personally I think
Rene for a girl looks uneducated or poorly thought out, like you didn't know the feminine form. The names are pronounced the same, so I don't see the point in not using
Renee for a girl.
Shannon (who knows there's an accent on the first 'e' in
Renee but can't put it there with this keyboard.)