Pathrusim together with Casluhim were descendants of Mizraim (i.e., Egypt) according to the genealogies in Genesis, who inhabited Pathros (i.e., Upper Egypt).[1]
In Saadia Gaon's Judeo-Arabic translation of the Pentateuch, the Sa'idi people (i.e. the people of Upper Egypt) are listed in the position of the Casluhim in Genesis 10:14,[2] while Albiyim is listed in the position of Pathrusim, however the ordering of Casluhim and Pathrusim sometimes vary in translations [3] and the mainstream understanding is that it is the Pathrusim who are the Sahidic people and the Casluhim the people of eastern Libya.
In the Book of Jasher,[4] the Pathrusim and Casluhim intermarried resulting in the Pelishtim, Azathim, Gerarim, Githim and Ekronim.