Caphthorim, Caphtorim(-s)

Boyd’s Bible Dictionary:

Either Philistines or Copts of Egypt (Gen. 10:14; Deut. 2:23; Jer. 47:4; Amos 9:7).

Concise Bible Dictionary:

The country from which, beside the Caphtorim, came some of the Philistines. They sprang from Mizraim, son of Ham (Deut. 23; Amos 9:7). In Jeremiah 47:4 (margin) the “isles” may only signify “maritime border.” Caphtor is supposed to be somewhere in Egypt, but has not been identified. See CASLUHIM

Strong’s Dictionary of Hebrew Words:

Transliteration:
Kaphtoriy
Phonic:
kaf-to-ree’
Meaning:
patrial from 3731; a Caphtorite (collectively) or native of Caphtor
KJV Usage:
Caphthorim, Caphtorim(-s)

Jackson’s Dictionary of Scripture Proper Names:

masculine plural of Caphtor

Potts’ Bible Proper Names:

An English form of Caphtorim [CAPHTOR], Deut. 2:23.