Personally, I would go for naming them after the twelve largest moons in the solar system, since they were originally (and still are in many cultures) based on the lunar cycles, giving the months Ganymede, Titan, Callisto, etc.
What would you rename the months?
Oneember, Twoember, Threeember, Fourember, Fiveember, Sixember, Sevenember, Eightember, November (just to fuck with people), Tenember, Elevenember, Twelveember
I was thinking about tossing in one “Greg” just to keep things interesting
Also not a bad idea at all :)