The Muslims who say that the original inhabitants of "Palestine" were from Abraham are mistaken. The Philistines (Palestines) were from Ham, and the Canaanites there were also from Ham, but Abraham was from Shem.
The descendents of Abraham and Hagar, and Keturah, settled in Arabia and further east.
The descendents of Abraham and Hagar, and Keturah, settled in Arabia and further east.