The origin of the surname XAVIER from everything that I have read comes from the Kingdom of Navarre, an independent monarchy. Henry III was its ruler until he succeeded to the throne of France as Henry IV. He was known as Henry of Navarre. Navarre was on two sides of the Western Pyrenees. The territory is now in Spain and France. It is now the Spanish Province of Navarra and a part of the French Department of Basses_Pyrenees. Pamplona is the Capitol of Navarre. The XAVIERs were prominent in the history of Navarre. The Xavier Castle and estate lay in what is now Spain. It is frequently said in family traditions & records that the XAVIERS were close kin to the reigning family and were of Bourbon descent through Charles of Orleans. Louis Stanilaus Xavier, Count of Provence, became King of France as Louis XVIII. The XAVIER in his name likely was a complimentary name of Saint Francis de XAVIER, however he may have been kin to Saint Francis. The source for this information comes from "Notable Southern Families Volume IV. The SEVIER Family" by Zella Armstrong. I am a descendant of Valentine XAVIER, a refugee from France who fled to London ENGLAND and changed his last name to SEVIER. My ggggg-grandfather was John SEVIER born 23 SEP 1745 in New Market VA he became the first Governor of TENNESSEE and he was a grandson of Valentine XAVIER the refugee.Hope this helps someone.