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.
"Damien," TV show
Sgt. DamienScott, main character in TV 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"
DamienThorn, the main character in "The Omen" horror film franchise and the TV show "Damien"
Damien Maslin, character in the "House of Night" series
Damien Brenks, character in the video game 'Watch Dogs'
Damien Darhk, DC character and character on The CW's "Arrow"
Damien Helbourne, character in the video game "Fantasy Life"
Damien Bloodmarch, character in the video game "Dream Daddy"
Damien (The Mayor), character in the web series "Who Killed Markiplier"