My Rex's are named after meat: RibEye, Sir Loin, Reuben, Ham Sandwich, Burger, etc. I have an Anklyosaurus named Annie Ankly Oakley. For some reason I have a habit of naming my Ptera's after 40's and 50's movie stars: Rock Hudson, Peter Lorre, Marilyn Monroe, etc.
I get the same thing in my single player. I'm heavily modded and have some additional dino mods added. I thought it might be because of the dino mods the spawning was glitching. I've just ignored them and avoided exploiting the glitch. In my game there are still jellies in the water as well, so I have to still be careful.