Numbers 32:39-41

Then the descendants of Makir of the tribe of Manasseh went to Gilead and conquered it, and they drove out the Amorites living there. So Moses gave Gilead to the Makirites, descendants of Manasseh, and they settled there. The people of Jair, another clan of the tribe of Manasseh, captured many of the towns in Gilead and changed the name of that region to the Towns of Jair.