From BiblePortal Wikipedia

Smith's Bible Dictionary [1]

Jat'tir.' (Pre-Eminent). A town of Judah, in the mountain districts,  Joshua 15:48, one of the group containing Socho, Eshtemoa, etc. See also  Joshua 21:14;  1 Samuel 30:27;  1 Chronicles 6:57. By Robinson, it is identified with Attir , six miles north of Molada and ten miles south of Hebron.

Hastings' Dictionary of the Bible [2]

Jattir . A town of Judah in the southern mountains, a Levitical city (  Joshua 15:48;   Joshua 21:14 ,   1 Chronicles 6:42 ). It was one of the cities to whose elders David sent of the spoil from Ziklag (  1 Samuel 30:27 ). Its site is the ruin ‘Attîr , N.E. of Beersheba, on a hill spur close to the southern desert.

Fausset's Bible Dictionary [3]

A town in the hills of Judah ( Joshua 15:48), one of the nine allotted to the sons of Aaron ( Joshua 21:14;  1 Chronicles 6:57). David sent presents there, from the Amalekite spoil ( 1 Samuel 30:27). Now 'Attir, 10 miles S. of Hebron. The Ithrites Ira and Gareb were probably from Jattir.

Morrish Bible Dictionary [4]

City in the highlands of Judah, allotted to the priests.  Joshua 15:48;  Joshua 21:14;  1 Samuel 30:27;  1 Chronicles 6:57 . Identified with ruins at Attir, 31 22' N, 35 E.

Holman Bible Dictionary [5]

 Joshua 15:48 1 Samuel 30:27 Joshua 20:14

Easton's Bible Dictionary [6]

 Joshua 15:48 21:14

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [7]

(Heb. Yattir', יִתַּיר [in  Joshua 15:48, elsewhere "defectively" יִתַּר ], Pre-Eminent; Sept. Ι᾿Εθέρ or Ι᾿Έθερ ), a city in the mountains of Judah ( Joshua 15:48, where it is named between Shamir and Socoh) assigned to the priests ( Joshua 21:14;  1 Chronicles 6:57). It was one of the places in the south where David used to haunt in his freebooting days, and to his friends in which he sent gifts from the spoil of the enemies of Jehovah ( 1 Samuel 30:27). The two Ithrite heroes of David's guard ( 2 Samuel 23:38;  1 Chronicles 11:40) were possibly from Jattir, living memorials to him of his early difficulties. According to Eusebius and Jerome (Onomast. s.v. Jether), it was in their day a very large hamlet inhabited by Christians, twenty Roman miles from Eleutheropolis, in the district of the Daroma, near Molatha (Reland, Palcest. p. 885). It is named by Hap-Parchi, the Jewish traveler; but the passage is defective, and little can be gathered from it (Zunz, in Asher's Benj. of Tudela, 2, 442). The required position answers nearly to that of the modern village of Attir, discovered by Dr. Robinson (Researches, 2, 194, 625) in this region, "marked by caves upon a hill" (comp. Wilson, Lands of Bible, i, 353), and situated fifteen miles south of Hebron, and five north of Moladah (Schwarz, Palestine, p. 105). It contains extensive ruins (Tristram, Land of Israel, p. 388).

International Standard Bible Encyclopedia [8]

jat´ẽr ( יתּיר , yattı̄r , and יתּר , yattir ): A town in the hill country of Judah, mentioned in conjunction with Shamir and Socoh (  Joshua 15:48 ); one of the cities given to the "children of Aaron the priest" ( Joshua 21:14;  1 Chronicles 6:57 ). David after his victory over the Amalekites sent a present of the spoil from Ziklag "to them that were in Jattir" ( 1 Samuel 30:27 ).

It is now Khirbet ‛Attı̂r , an important ruin, in the extreme South of the hill country, 5 miles Southeast of edh Dharı̂yeh and 20 miles Southeast of Beit Jibrı̂n . This must correspond to the "very large village Jethira" which is mentioned in Eusebius, Onomasticon (119 27; 133 3; 134 24, etc.) as 20 miles Southeast of Eleutheropolis (i.e. Beit Jibrı̂n ). The site is full of caves. See Pef , III, 408, Sh Xxv .