Concerning Maachah - See the matter fully explained in the note on 1Ki 15:13 (note).
The Jews imagine that Maachah repented, and her name became changed into Michaiah, daughter of Uriel of Gibeah; and that this was done that there might be no mention of her former name, lest it should be a reproach to her: but we have already seen another gloss on this name. See on 2Ch 11:20 (note).