J.S.
I hear you about the novelty items and sibling rivalry aspect. My daughter Madeline is excited the few times she finds items. My little Elliot is always dissapointed though and gets mad when she has something and he doesn't.
Here are my ideas:
Kiera
Kiana
Kiara
Kaylee
Kimora
Kimari
Katriana
Katrina
Karen
Kari
Karla
Kimberly
Kylie