John Potter
Rex IS his real name. But his real SURNAME is ancient.
Rex Ryan
t rex
In the spin-off of this book, Small Steps, it says that X-Ray's real name is Rex Alvin Washburn.
No christopher marcus brown
Rex
Simon Rex :)
no
Rex its piglatin
Rex
The blue triceratops's name is "Trixie" and the green T-Rex's name is "Rex"