I’m somewhat familiar with how the avoidance register works in Walpiri, and the switch is solely based on the social relationship, not the names involved. It’s

I’m somewhat familiar with how the avoidance register works in Walpiri, and the switch is solely based on the social relationship, not the names involved. It’s a fairly complex sub-language - there’s a different set of words that get used only for the avoidance register or are very generic terms from standard speech, and the grammar is simplified. The pronunciation is also shifted a bit, iirc (I want to say it uses creaky voice, but I’m not sure).