Charles Ellicott Commentary Zechariah 12:13

"the family of the house of Levi apart, and their wives apart; the family of the Shimeites apart, and their wives apart;" — Zechariah 12:13 (ASV)

Shimei.—Not the Benjamite tribe (2 Samuel 16:5), but from the family of Gershon, son of Levi (Numbers 3:17). Thus, from the two tribes, he mentions one leading family and one subordinate branch, and then, in Zechariah 12:1, he encompasses them all together and even mentions their wives apart, to show how general, and yet particular, the mourning should be.