I'm sure this is not a legitimate variant, but
Kyril is the name of the main hero in the RPG Suikoden Tactics (
http://www.suikosource.com/games/gst/). I love the Suikoden game series, and there are many, MANY characters, so several names are tied to it in my mind. Kyril is pronounced like Cyril but with a hard K sound (KEER-ill). I really like it and prefer it to the soft C of Cyril, even if it isn't a real name.
Kira is nice, but I don't like the spelling Keira because I can't stand Keira Knightley. Kira, with this spelling, makes me think of Kira Nerys from Star Trek: Deep Space Nine. I'm a Trekkie, so that's a
much better association.