Lunar colonies will exist in 30 year's time because 12 people have already been to the moon, so why can't people in 2045? They will probably have the technology to do so, and more people will be on Earth, so people will probably move to the moon for those reasons.
Even if lunar colonists chose an offensive name, those left down on Earth would have to respect the choice. The moon is essentially a low gravity weapons platform.
Chances are that the names "Moon" and "Luna" won't be kept long by anyone willing to abandon Earth for life on the moon.