Here. Unstupid yourself:
The name Palestine refers to a region of the eastern Mediterranean coast from the sea to the Jordan valley and from the southern Negev desert to the Galilee lake region in the north. The word itself derives from "Plesheth", a name that appears frequently in the Bible and has come into English as "Philistine". Plesheth, (root palash) was a general term meaning rolling or migratory. This referred to the Philistine's invasion and conquest of the coast from the sea. 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. They had no connection, ethnic, linguistic or historical with Arabia or Arabs.
The Philistines reached the southern coast of Israel in several waves. One group arrived in the pre-patriarchal period and settled south of Beersheba in Gerar where they came into conflict with Abraham, Isaac and Ishmael. Another group, coming from Crete after being repulsed from an attempted invasion of Egypt by Rameses III in 1194 BCE, seized the southern coastal area, where they founded five settlements (Gaza, Ascalon, Ashdod, Ekron and Gat). In the Persian and Greek periods, foreign settlers - chiefly from the Mediterranean islands - overran the Philistine districts.
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 AD 135, 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 Judaea" 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 Palaestina, from which the modern, anglicized "Palestine" is derived.
Google when in doubt.