[mongol]

Master in git I assumed is the same as tape master, master copy etc. I never heard about slave in git context. Which makes it even more absurd.

[akvadrako]

Master in git comes from BitKeeper, where it was used in master/slave context.

[marcan_42]

That connection has been contested, but even if that is the case, nobody using git would think of that, since slaves aren't a thing in git itself.