I've heard and read that the modern day Palestinians are remnants of the ancient Philistines, which is another term without a real definitive genealogical determination, at least according to the satisfaction of today's so-called "experts" on such.
The English word Philistine comes from Old French Philistin, from Classical Latin Philistinus, from Late Greek Philistinoi, from Hebrew Philištim, "people of Plešt", and there are cognates in Akkadian Palastu and Egyptian Palusata; the term "Palestine" has the same derivation.
https://en.wikipedia.org/wiki/Philistines
I'm more inclined to believe it based on the historical accounts in the Old Testament of their never ending conflicts with the Israelites, which they persist in to this day.
They in fact held Israel in captivity for many, many years. It was Samson, dedicated to God's service before his conception, who would "begin to deliver Israel out of the hand of the Philistines."
But it was David who finally got the job done.
The modern day definition of a "philistine" (n. A smug, ignorant, especially middle-class person who is regarded as being indifferent or antagonistic to artistic and cultural values. n.One who lacks knowledge in a specific area.) gives even more credence to the assertion, in my opinion--the Palestinians are not very nice people, to put it mildly.
I use the term myself, to express my disdain and disapproval of modern day "artistic and cultural values":
"Just call me Goliath, for I am giant among the Philistines."