Ex patriate

An expatriate (in abbreviated form, expat) is a person temporarily or permanently residing in a country and culture other than that of the person's upbringing or legal residence. The word comes from the Latin ex (out of) and patria (country, fatherland), and is sometimes misspelled (either unintentionally or intentionally) as ex-patriot or short x-pat, because of its pronunciation.
See more at Wikipedia.org...

A person who has abandoned his or her country of origin and citizenship and has become a subject or citizen of another country. - (read more on Ex patriate)