I was under the impression the specific use of the phrase 'Lunar' is meant to distinguish Earth's Moon from others. Like how the phrase 'Terra' is meant to distinguish our planet from other 'earths'
Someone is following what I'm saying. It reminds me of the DS9 episode 'By Inferno's Light' where Dax questions the wisdom of going to warp while in a 'solar system'. There's only one Solar System and it's ours... Sol distinctly refers to our sun only. The correct generic term would have been 'stellar system' or specifically the Bajoran System. So following this line of thinking, as far as I can figure is that there must be a colony called Vulcanis on our moon.