Actually, the ancient Philistines & modern Palastinians have something in common. Both are invaders from other lands.
The Philistines were a confederation of non-semitic peoples coming from Crete, the Aegean Islands and Asia Minor, also known as “Sea Peoples.”
The main tribes were Tzekelesh, Shardana, Akhaiusha, Danauna, Tzakara, Masa, Meshwesh, Lukki, Dardana, Tursha, Keshesh, Karkisha, Labu and Irven.
The original homeland of the group that ruled the Philistine Federation, namely the “Pelesati,” was the land of Crete.
When the Minoic civilization collapsed, the Minoic culture also disappeared from Crete, as invaders from Greece took control of the Island. These ancient Cretans arrived in Southern Canaan and were known as “Pelestim” and “Keretim” by Hebrews and Canaanites.
Their first settlement was in Gaa, whose original name was “Minoah,” a clear reference to the fallen Minoic Kingdom.
They also invaded Egypt and were defeated by Pharaoh Ramose III in the 12th Century BC.
The Philistines were organised in city-States, being the most important the Pentapolis: Gaza, Ashdod, Ashkelon, Gath and Ekron and their territories were close to the Mediterranean Coast a little longer and broader than the present-day “Gaza Strip.” Not all Judea; they never reached Hevron, Yerushalime or Jericho!
These Sea Peoples were expelled towards other Mediterranean Lands and did not evolve into any Arab people, but disappeared as distinguishable groups in Roman times.
The Philistines were not Arabs nor even Semites, they were most closely related to the Greeks originating from Asia Minor and Greek Localities. They did not speak Arabic and Islam was NOT founded yet by Muhammad. They had no connection, ethnic, linguistic or historical with Arabia or Arabs.
Those dwelling in Canaan were defeated by King David and reduced to insignificance, the best warriors among them were chosen as David’s bodyguard.
The remaining Philistines still dwelling in Gaza were subdued by Sargon II of Assyria and after that time, they disappeared definitively from history.
From the fifth Century BC, following the historian Herodotus, Greeks called the Eastern Coast of the Mediterranean “The Philistine Syria” using the Greek language form of the name.
In 135 AD, after putting down the Bar Kochba Revolt, the second major Jewish revolt against Rome, the Emperor Hadrian wanted to blot out the name of the Roman “Provincia Judea” and so renamed it “Provincia Syria Palaestina.”
The Latin version of the Greek name and the first use of the name as an administrative unit, the name “Provincia Syria Palaestina” was later shortened to Palestina, from which the modern, anglicised “Palestine” is derived.
Palestine became three Palastines and they persisted unto the Seventh Century the time of the Muslim conquests. The Christian Crusaders employed the word Palestine to refer to the general region of the “Three Palestines.”
After the fall of the Crusader Kingdom, Palestine was no longer an official designation. The name, however, continued to be used informally for the land on both sides of the Jordan River.