Xristina might be from other culture
X in Cyrillic is kh sound and sometimes here we can write it as still x. In my country we have
Khrystyna which has kh, with kh so do Russia, Greece, other countries. In places like Azerbaijan x in Latin means kh. So it maybe is just transcription choice or Russian person from Azerbaijan or other country that do that?
Or it is just English person with kre8tiv parents...