So Saul broke off his pursuit of David and went to meet the Philistines. That is why that place is called Sela-hammahlekoth.

1 Samuel 23:27
Then a messenger came to Saul, saying, "Come quickly, for the Philistines have raided the land!"

1 Samuel 23:29
And David went up from there and lived in the strongholds of En-gedi.

1 Samuel 24:1
After Saul had returned from pursuing the Philistines, he was told, "David is in the wilderness of En-gedi."

Why Saul returned from pursuing after David, and went against the Philistines: therefore they called that place Selahammahlekoth.