I have a question about Jurassic World. Why was the Indominus Rex called Indominus Rex when "indominus rex" means "untamable king" and it's clearly stated that the Indominus Rex was female, which would have made it indominus regina, which means untamable queen.
In universe it's clearly because it's supposed to be an improvement on tyrannosaurus Rex.
Out of universe, the name is literary foreshadowing. It's a significant name trope. Indomitable, they try to capture and control it. They fell. Irony 101.
As to the Rex part, this is rooted in modern english preference of male as the default gender. The species is called Rex, while the individual could be either gender. Mankind, male in female, etc. The T-Rex from the first movie which also shows up in Jurassic World is also female, but still referred to as T-Rex, not regina.
Of course, the proper name would be Indomina Regina, not Indominus Regina. The Indominus would also change suffix on a gender change.