Rexy Bexy (if female)
Rex

Name ideas for your Rex from ARK players.
Indo Daddy
ICameinlikeaRexingBall
Braccus
REXIT
Bonecrusher
Wrecksy
Iron Tyrant
Terry(Dinosaur king)
Tina from TAWOG anybody?
Sal(meebs gaming)
Tyrantrum (pokemon)
Thunder
Perry The Platypus?!
Steel Bite
Rexis
If black Darth rex
Secksy Rexy
Blood shot
Broken Fang