[name_f]Millie[/name_f] is very sweet! I love [name_f]Millicent[/name_f] for a longer birth certificate name.
[name_f][/name_f]Other M names I see as having [name_m]Southern[/name_m] and/or vintage charm:
[name_f][/name_f][name_f]Marigold[/name_f]
[name_f][/name_f][name_f]Maude[/name_f]
[name_f][/name_f][name_f]Mercy[/name_f]
[name_f][/name_f]Maeleen (could be spelled lots of different ways, but I met one who uses this spelling)
[name_f][/name_f][name_f]Maelie[/name_f]
[name_f][/name_f][name_f]Margaret[/name_f] (I love the nickname [name_f]Margot[/name_f], but there are about a million for [name_f]Margaret[/name_f], including [name_f]Peggy[/name_f] and [name_f]Daisy[/name_f] which both sound [name_m]Southern[/name_m] to me!)
[name_f][/name_f][name_f]Miriam[/name_f]
[name_f][/name_f][name_f]Mirabelle[/name_f]
[name_f][/name_f][name_f]Mabel[/name_f]
[name_f][/name_f][name_f]Marielle[/name_f]
[name_f][/name_f][name_f]Meredith[/name_f]
[name_f][/name_f][name_f]Marina[/name_f] (Marnie would be a cute vintage nickname)
[name_f][/name_f][name_f]Melina[/name_f]
Have fun with girl names! I find boy names way harder, but you chose great ones!