From the avatar wiki:
The term "Avatar" comes from the Sanskrit word avatāraḥ (अवतारः), which means "descent". In Hinduism, Vishnu manifests himself as an avatar to restore balance on earth, during a period of imbalance.
And there's a lot of overlap with Hindi Avatars in general: https://en.m.wikipedia.org/wiki/Avatar.
So pretty apt if you ask me
I have no personal experience with it, but you might be interested in this completely open source mouse:
https://ploopy.co/mouse/
https://github.com/ploopyco/mouse
It looks like you can buy a fully assembled mouse, a build it yourself kit, or do it from scratch with the schematics. Doesn't come with quite as many side buttons though