Adam Clarke on Micah 1:15

Yet will I bring an heir unto thee, O - Mareshah - Here is another instance, הירש haigeresh, to bring an heir, and מרשה mareshah, the city, the name of which signifies heirship. And so of the above proper names.

Adullam the glory of Israel - This was a fenced city in the south of Judah (see 2Chr 11:7) towards the Dead Sea.

There is much obscurity in the concluding verses of this chapter. They undoubtedly refer to the captivity of Israel, and to circumstances of distress, etc., which are not mentioned in any of the historical books, and therefore their reference and meaning can only be conjectured.