C. F. Keil and Franz Delitzsch on Judges 15:9

Jdg 15:9

The Philistines came (“went up,” denoting the advance of an army: see at Jos 8:1) to avenge themselves for the defeat they had sustained from Samson; and having encamped in Judah, spread themselves out in Lechi (Lehi). Lechi (לחי, in pause לחי, i.e., a jaw), which is probably mentioned again in 2Sa 23:11, and, according to Jdg 15:17, received the name of Ramath-lechi from Samson himself, cannot be traced with any certainty, as the early church tradition respecting the place is utterly worthless. Van de Velde imagines that it is to be found in the flattened rocky hill el Lechieh, or Lekieh, upon which an ancient fortification has been discovered, in the middle of the road from Tell Khewelfeh to Beersheba, at the south-western approach of the mountains of Judah.