Ganto's full name is "Gigantopithecus Gorilla" . Gigantopithecus means "Giant Ape" in Latin and is the scientific name for an extinct prehistoric ape.
Though the show's title and the park in which the show takes places is called "Gorillaville" there are several different species of Apes and Monkeys in the show. Ganto and Mocha are Gorillas. Claude is an Orangutan. Bobo is a Bonobo. Manny is a Squirrel Monkey. Jeremiah is a Proboscis monkey and Foo-Foo is a black and white ruffed Lemur.
Ganto, Bobo and Claude are voiced by the show's creator: Ron Yavnieli. The voice Ron does for Ganto is based on other people's imitations of him.