Easton's 1897 Bible Dictionary:

Debir
   oracle town; sanctuary. (1.) One of the eleven cities to the
   west of Hebron, in the highlands of Judah (Josh. 15:49; Judg.
   1:11-15). It was originally one of the towns of the Anakim
   (Josh. 15:15), and was also called Kirjath-sepher (q.v.) and
   Kirjath-sannah (49). Caleb, who had conquered and taken
   possession of the town and district of Hebron (Josh. 14:6-15),
   offered the hand of his daughter to any one who would
   successfully lead a party against Debir. Othniel, his younger
   brother (Judg. 1:13; 3:9), achieved the conquest, and gained
   Achsah as his wife. She was not satisfied with the portion her
   father gave her, and as she was proceeding toward her new home,
   she "lighted from off her ass" and said to him, "Give me a
   blessing [i.e., a dowry]: for thou hast given me a south land"
   (Josh. 15:19, A.V.); or, as in the Revised Version, "Thou hast
   set me in the land of the south", i.e., in the Negeb, outside
   the rich valley of Hebron, in the dry and barren land. "Give me
   also springs of water. And he gave her the upper springs, and
   the nether springs."

     Debir has been identified with the modern Edh-Dhaheriyeh,
   i.e., "the well on the ridge", to the south of Hebron.

     (2.) A place near the "valley of Achor" (Josh. 15:7), on the
   north boundary of Judah, between Jerusalem and Jericho.

     (3.) The king of Eglon, one of the five Canaanitish kings who
   were hanged by Joshua (Josh. 10:3, 23) after the victory at
   Gibeon. These kings fled and took refuge in a cave at Makkedah.
   Here they were kept confined till Joshua returned from the
   pursuit of their discomfited armies, when he caused them to be
   brought forth, and "Joshua smote them, and slew them, and hanged
   them on five trees" (26).


Hitchcock's Bible Names Dictionary (late 1800's):

Debir, an orator; a word