Casluhim ben Mizraim

Biography
Casluhim, per the Book of Genesis 10:13-14, is the son of Mizraim, the grandson of  Ham and a great-grandson of  Noah who fathered the many Mizraim tribes that settled in the land of Egypt.

Casluhim were a people descended from Mizraim, according to Genesis 10:13, 1 Chronicles 1:11, who who inhabited Pathros (i.e., Upper Egypt).

Book of Jasher Narrative
In Parry, J. H. (ed.). [http://www.sacred-texts.com/chr/apo/jasher/10.htm 10:23. Book of Jasher], the Pathrusim ben Mizarim and Casluhim intermarried resulting in the Pelishtim, Azathim, Gerarim, Githim, and Ekronim.

"23 And the children of Pathros and Casloch intermarried together, and from them went forth the Pelishtim, the Azathim, and the Gerarim, the Githim and the Ekronim, in all five families; these also built themselves cities, and they called their cities after the names of their fathers unto this day."

Philistines
According to Genesis 10:14 and 1 Chronicles 1:12, they were descendants of Mizraim (Egypt) son of Ham, out of whom originated the Philistines.

Ancient Egyptian History
The Egyptian form of their name is preserved in the inscriptions of the Temple of Kom Ombo as the region name Kasluḥet. In the Aramaic Targums their region is called Pentpolitai understood to be derived from the Greek Pentapolis which locates the area as the north west in what is now the Cyrenaica region of Libya. Another name for their region is Pekosim used in Bereshit Rabbah 37. In Saadia Gaon's translation of the Pentateach into Arabic, the Sahidic people (i.e. the people of Upper Egypt) are listed in the position of the Casluhim in Genesis 10:14 and the Pathrusim are listed as Albiim, however the ordering of Casluhim and Pathrusim sometimes vary in translations [2] and the mainstream understanding is that the Pathrusim are the Sahidic people.

Josephus Narrative
Josephus mentions the Casluhim in his Jewish Antiquities I, vi, 2 as one of the Egyptian peoples whose cities were destroyed during the Ethiopic War and who thus disappeared from history.