The Greeks may have invented the word "Philistine," (I really think Herodotus used the word "Palestine.") but that was how they identified a distinct group of non-Greeks.
As for the "People of the Sea," there is at least some doubt as to who they were. Velikovsky thinks they were Persians. (Also see: here.)
ML/NJ
Thank You for the info. Interesting subject in light of the current events.