Caphtor is recorded as the original region of the Philistines.
Deuteronomy 2:23(As for the Avvites who lived in villages as far as Gaza, the Caphtorites who came from Caphtor destroyed them and settled in their place.)
Jeremiah 47:4For the day is coming to destroy all the Philistines and to cut off from Tyre and Sidon every helper that remains. For the Lord will destroy the Philistines, the remnant of the isle of Caphtor.