The irish/gaelic pronounciation is Kee-ruh. In the US it´s mostly pronounced wrong as Key-air-uh or even Cee-air-uh (like
Sierra).
If you like the pronounciation Key-are-uh you should probably use
Chiara to avoid confusions.
I personally love the name
Ciara! But because of the pronounciation and spelling confusions I would spell it
Keira.