They're referring to proto-indo-european im pretty sure, and the similarity of the origin word for name to the sound no-men/no-man, this goes into the sovereign citizen thing that they were talking about earlier than a name is an assignment of office, so a name isn't a man aka isn't you

And that feeds into their conspiracy theory that the name given to you is actually someone else's so if you refuse your name you become a sovereign citizen, and don't need to follow certain laws as they apply to your name not you as an individual