1. Kee-ruh.
2. Kee-ruh, K-ay-ruh, Kee-ruh, K-ay-ruh.
3.
Kira, by far.
4. Not at all.
5. Only one,
Keira. There's a character on Deep Space 9 called
Kira (family name) who I principally associate it with.
6. Yes, yes, yes.
7.
Kira Estella, but I don't much like either of them because they end in the same sound.