Board Thread:Monster Discussions/@comment-26083816-20150207025822/@comment-24572700-20150804202637

Varan's name is derived from varanid, which is a group of lizards, so that's another possible meaning. He is very lizard-like; gliding like a flying dragon (Draco volans, not an actual dragon :p), a row of iguana-like spines on his back and generally looking very lizard-like; so I wouldn't be surprised if that was the name's origin. Plenty of varanids are also semi-aquatic, as well.

As for Gorosaurus, it could be "rumbling lizard" in reference to his deep, rumbly roar. It could also be a pun on Gorgosaurus, since both are theropods that have very similar names in both English and Japanese.