[Jim W N]

The Jews (Hebrews) originated from Abraham, Isaac, and Jacob.

Some of the Philistines may have been assimilated into the Jewish population - but not the other way around - as other groups over time have also mixed in with part of the Jewish population.

[Cronos]

1. The "Hebrews" were not only "Jews" i.e. Judeans (tribe of Judah) but also the other 11 tribes. These were peoples who weren't 'lost' per se, but
   • Some, like the Benjaminites and Simeonites and some Levites were absorbed into Judea and became "Jews"
     
     
   • Some, like the Danites and Nephthalites were absorbed into the Canaanites (Phoenicians) and Arameans
     
     
   • Others became the sAmaritans (who have the Cohen gene)
     
     
   • Others after deportation were absorbed into the peoples of what is now present day Iraq, Iran and Syria
2. the Jews also assimilated
   • Neighboring semitic peoples like Edomites (Idumeans) - completely and SOME Moabites, Ammonites, Arameans, etc. etc. - remember that people did convert to Judaism or, as in the case of Edomites were forcibly converted
     
     
   • some descendants of Philistines - the consensus is that the Philistines were proto-Greeks related to Pelasgians from the Greek peninsula who spoke an Indo-European tongue

The Philistines were too small in number to assimilate anyone and over time they got assimilated