I say it rom-illy. I really like it even though it’s not one I usually like. I love [name_u]Romy[/name_u] as a nickname and [name_f]Milly[/name_f] if she wants something more feminine sounding. I don’t think it’s frilly, but I think it’s appropriately girly while still sounding sort of boyish.
[name_f]Romilly[/name_f] is a unisex name so no I don’t find it frilly or feminine. It’s a favorite love for both genders but the sound is more boyish (I pronounce it Rom-illy). For a boy, I like the nn, [name_m]Rome[/name_m] and for a girl, [name_u]Romy[/name_u]
It’s a pretty name, I like how the more masculine [name_f]RO[/name_f] sound balances out the frilliness of the milly. I’d like Rumilly better. My only concern with an unusual name that ends the way this one does is that it sounds and is spelled, upon first impression, like perhaps the parents are just TRYING to be different. Still, that might fall off once people meet the person with the nice and unusual name.