Regardless of the place of origin of the Philistines, whether Crete or Egypt, or anywhere else, we do know for certain how “Philistine” became “Palestine.” The name Palestine originated from the Greek word pronounced Palaistina, which is derived from the Hebrew word pronounced pel-eh-sheth, meaning land of the Philistines (one of the most famous of whom was Goliath). The original word referred only to a small coastal territory corresponding to what is today Gaza, never to all of the land of Jacob, who God renamed Israel.
After about 1250 BCE, the Philistines occupied the coastal plains and foothills of Palestine, south from about present-day Tel Aviv. In later centuries they absorbed the culture and religious beliefs of their northern neighbours, the Canaanites, and became indistinguishable from them. The Hebrew people occupied the inland, in an area somewhat larger than today’s Western Bank.
CATHOLIC ENCYCLOPAEDIA "The Philistines were a people from the area of the Aegean Sea who invaded the southern coast of Palestine and threatened the Israelites.
In the latter half of the 2d millennium b.c., invading Indo-European tribes forced many people living on the islands and coast of the northeastern Mediterranean out of their original homeland. These displaced people attacked the hittites in Asia Minor and the cities of the North Syrian and Palestinian coast; they finally invaded Egypt in the reign of Ramses III, who defeated them in a land and naval battle fought on the coast (c. 1170 b.c.). When these so-called Peoples of the Sea were forced out of Egypt, one group, the Tsikal, settled in the coastal area of Palestine at the vicinity of Dor (South of Carmel). Another group that are called prst in the Egyptian records settled along the Palestinian coast south of Dor.
Their Egyptian designation, pronounced approximately pulastu, corresponds to the name p elištîm, Philistines, by which they were known to the Israelites. The name Palestine is derived from it. In a short time the Philistines took over the area between Joppe and the Wadi Ghazzeh and formed a pentapolis, a group of “five cities,” consisting of Gaza, Ashkelon, and Ashdod (later Azotus) on the coast and