In French
Jean and
Jeanne are not pronounced the same. The boy's name
Jean (=
John) is pronounced with an "ah" vowel sound and the "n" is nazalized.
Jeanne is pronounced with a short "a" and the "n" sound is normal. It rhymes with English
Jan or
Ann, "zhan." They sound very different to me.
BTW, I too like (Scottish)
Jean and (English)
Joan for girls. :-)