Wtf are you talking about? It doesn't have a fucked up name origin at all. It was named "master" as in "master recording", like in music production. Proof: https://x.com/xpasky/status/1271477451756056577.

Master/slave concepts were never a thing in git. The whole renaming thing was really fucking stupid. Caused plenty of breakage of scripts and tools for absolutely no good reason whatsoever.