I like it but I definitely think of Frozen. I have a preschooler and toddler so Frozen is huge among their peers. I don't think it's a deal breaker, it seems like most little girls want to be Elsa and love the character.
If you like it, then it's a good name! Personally, NMS, but there is no reason you shouldn't choose a name if you like it, regardless of popularity or internet strangers opinions.
Fwiw one of our potential girls names had a similar middle name: Katherine Ilse, pronounced Ill-sa. It's a family name. Point being, if you're worried about the frozen association it could make a nice MN!
Re: Girls Name Help
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Point being, if you're worried about the frozen association it could make a nice MN!