Charles Spurgeon Commentary Zechariah 11:12

"And I said unto them, If ye think good, give me my hire; and if not, forbear. So they weighed for my hire thirty [pieces] of silver." — Zechariah 11:12 (ASV)

And the land shall mourn, every family apart; the family of the house of David apart, and their wives apart;

For this was to be a personal sorrow, in which both husbands and wives must weep on their own account.

The family of the house of Nathan apart, and their wives apart; (Zechariah 12:12)

Perhaps these names are mentioned to indicate different classes and orders of persons: the family of the house of David the king shall mourn, and the family of the house of Nathan the prophet shall mourn. Both David and Nathan had long since gone, but their descendants were still called by their names.