When running BAT mod, I was surprised to see that the Maceman has been renamed Heavy Footman. In the help, I don't see which mod would be responsible for this change. Are there other naming changes like this in BAT?

It's Varietas Delectat. It's because many of the units in that category do not weild a mace.

Interesting. The description of the mod doesn't say anything about changing base unit names. Are there any other base units that are renamed?

IIRC, the Horse Archer might now be a Horseman.