They were based on a group called the Anibots, later faction-changed to Anicons, in the early script for Transformers: the Movie. The closest 3rd party set is called the Feralcons and Feral Rex.

Most G1 gestalt names are basically variations on standard words, e.g. Bruticus = Brute + suffix 'icus', 'Menasor' = Menace + 'or', Abominus = 'Abominable' - 'able' + 'us'. The names are usually reflective of their character or traits, e.g. Defensor is defensively focused, Computron 'computes'/is smart. So if you wanted an original name for him, take something animalistic and scary-sounding and base it on that, e.g. 'hunt', 'savage', 'wild', etc.