The KJV refers to them under two different names, saying they came from Caphtor; however, as Velikovsky pointed out, if Caphtor doesn't refer to Cyprus, there is no name in the Bible for that nearby large island. The Biblical term Cherethites ('keret-tites') refers to Cretans. The Egyptians referred to Caphtor (Cyprus) as Keftiu (Kftyw).
The Philistines seem to have changed, culturally, linguisitically, and probably ethnically, over a period of centuries (who doesn't?), with olive oil presses and Greek pottery styles later on, at least one non-Semitic king name (all 7th c BC).
Giving Goliath His Due:
New Archaeological Light on the Philistines
by Neal Bierling
foreword by Paul L. Maier
online version
The name Goliath, like Achish, is not Semitic, but rather Anatolian (McCarter 1980, 291, Mitchell 1967, 415; Wainwright 1959, 79). Not all agree though; the International Standard Bible Encyclopedia (2:524) proposes that Goliath may have been a remnant of one of the aboriginal groups of giants of Palestine who now were in the employ of the Philistines. [1. Naveh (1985, 9, 13 n. 14) states that Ikausu, the name of the king of Ekron in the seventh century b.c., is a non-Semitic name that can be associated with that of the Achish of Gath in David's time. The name in the seventh century has a shin ending that is non-West Semitic.]
(there's a
later edition of the work, although I'm not sure it's still in print, the publisher was acquired)