See https://github.com/bitkeeper-scm/bitkeeper/blob/master/doc/H... for master/slave terminology.
In any case, the git dev responsible for the choice has made their views known: https://twitter.com/xpasky/status/1271477451756056577
> "master" as in e.g. "master recording". Perhaps you could say the original, but viewed from the production process perspective.
> A clueless Central European youngster whose command of English was mostly illusory came up with the term, which is why it isn't very obvious...
https://twitter.com/xpasky/status/1272280760280637441?s=20
I always thought it meant "master copy"...
Apparently, nobody here understands that.
Digging into the usage of Master for "Master Copy" you could say the intention is that the master copy has authority, or highest standing, over all other copies, so more or less the meaning they were trying to avoid.
They are not unrelated. I'm not making an argument whether the word is inappropriate or not. Just pointing out an etymological fact.