Converting Damian to Damien -- or Julian to Julien or Lucian to Lucien -- adds a certain je ne sais quoi to names. But most people won't know that you're using the French form and will just think you're fuzzy on your spelling.
St. Damien of Molokai
Damien Fahey, American broadcast journalist
Damien Haas, American actor
Damien Hirst, British artist
Damien Sandow, American professional wrestler
Damien Dante Wayans, son of actress Elvira Wayans
Damien Bodie, Australian actor
Sgt. Damien Scott, main character in t.v. series, Strike Back, played by actor, Sullivan Stapleton
Damien Delgaard, recurring villain on Gossip Girl
Damien Karras, a priest in the classic horror film "The Exorcist"
Damien Thorn, the main character in "The Omen" horror film franchise
Damien Maslin, character in the House of Night series