To be honest, unless you have heritage in Arabic-speaking countries, Saira looks tryndeigh, misspelled, and kreyativ. Sarah "Sairy" is perfectly fine.SIE-rah sounds horrible to me, sorry, but yes, Cyra would be easier (though you'd probably get KIE-rah).
The thing is, I don't say Sarah like SAIR-a. It's more like SA-ruh. So in this case, Arabic or not, I think Saira "Sairy" would make more sense.Thanks for your imput. :)