For me, it's pronounced the same as
Ivor (non-rhotic accent here), so it feels weird for a girl. Plus there's all the 'Ivah/Ivor Whopper', etc jokes. Not a huge fan. Still, here's some suggestions for mns:
Ivah GeraldineIvah IreneIvah Beatrice*
Ivah EmmelineIvah Jessamine*
Ivah Hermione*
Ivah GeorgianaIvah JaimeIvah Harriet*
Ivah HeroIvah HesterIvah RosettaIvah Sinead*
Anything take your fancy?
Hmm just realised it could be prn like
Eva. In which case I still don't like it, but some of those combos won't work. I'm going to add asterisks to ones I think could work with this prn.