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The Arabic name of Palestine is Filisṭīn. Two things here are important for understanding when and how this word may have entered Arabic. The first is that it has /f/.
There *were* people during the Hebrew revival (incl. Ben Yehuda himself) who strongly advocated for incorporation of Arabic loans & neologisms derived from Arabic roots, but the actual impact of those efforts amounts to little in Hebrew as it actually exists and is used today.
Deliberate grammatical thinking about Hebrew in the Middle Ages was profoundly influenced by the Arab tradition, so much so that it wouldn't be too much of a stretch to say early Hebrew grammarians were basically continuing the Arab grammarian tradition with a different language
There's like one guy made this argument in the 80s and it didn't really catch on. Your fucking JSTOR-jaunts aren't a substitute for actual familiarity with scholarly literature.
First, there's every indication that the Philistines, whatever their origin, adopted local Canaanite ways of being very quickly.