Xavier is one of those rare X names that actually sounds cool and not strange. The name first gained fame among Catholics due to Jesuit founder St. Francis Xavier. In more current times, it's notable among comic fans everywhere as Professor X (full name Charles Xavier), founder and leader of the X-Men. The name has had its ups and downs in popularity, but is currently on a major upward swing and sits comfortably in the Top 100.
Cuban musician Xavier Cugat
Son of Tilda Swinton, Son of Donnie Wahlberg