I love the month of January - it is summer here - and can see it as a feminine name, surely, though I've never met a January.
Some ideas I hope aren't repeats (Wordsmith listed many I love!):
January
AmaryllisJanuary Audeline
January
BeatrixJanuary
CecileJanuary
DomitilleJanuary
EstelleJanuary
FrancesJanuary Hesper
January
HesterJanuary
IsisJanuary
IrisJanuary
JonquilJanuary
LeopoldineJanuary Loveday
January
LucastaJanuary
MillicentJanuary Plum
January
PosyJanuary
Violette