And of the children of the priests: the children of Habaiah, the children of Koz, the children of Barzillai; which took a wife of the daughters of Barzillai the Gileadite, and was called after their name:
The verse says: Priest's children - Habaiah's kids, Koz's kids, Barzillai's kids. One of them married a woman from Barzillai's family (from the area of Gilead) and was given their name.