Responses
A good question, maybe the Author will see your question and use this as an idea , I mean if we think this way is like "that time I got reincarnated as a slime" where Rimuru gives names to the monster and its drain a bit of his power
a. the names that the Maze Lord hold lose power as it is given to the new name
b. the constellation loses all their power associated with their stolen name
c. they become mortals again (=・ω・=)