Lil Man or Lil bro
Rex

Name ideas for your Rex from ARK players.
Doe Buck Junior Roberta Rexy
Giga from wish.com
Compy(because rex comp a LOT!!!!!!!!!!!!)
Big stamper (because it stomps big)
Se*y rexy
BOB killer
Mini Giga 💀
The texinator
Eee…
The one who rors
WreckingXboxKidsLifes
T Rez
Cluck (because it’s an oversized chicken)
Cupcake
Brutus Jr.
Sonny
Scorrvo
Lawyer
Lex would work