Both
Kira and
Kyra can be mistakenly prn. KYE-ruh.
Kyra does not look like KEER-uh to me at all.
Kiera will be mistaken for KEE-air-uh, in the United States, but so will
Keira (although I don't know why).
To me, the best way to spell KEER-uh, in the US is
Keira. But any of these names have mispronunciation potential.
"No one can make you feel inferior without your consent."
-
Eleanor Roosevelt