These were the descendants of Manasseh: The Machirite clan from Machir, the father of Gilead, and the Gileadite clan from Gilead.
Jewish Publication Society of America Version (JPS1917) - Numbers 26:29 >The sons of Manasseh: of Machir, the family of the Machirites — and Machir begot Gilead; of Gilead, the family of the Gileadites.