From BiblePortal Wikipedia

Fausset's Bible Dictionary [1]

S. of Judah ( Joshua 15:30). Perhaps the same as Bethul, of Simeon, within Judah's inheritance, or Bethuel ( Joshua 19:4;  1 Chronicles 4:30;  1 Samuel 30:27), "Bethel" among the cities of the extreme S.

Hastings' Dictionary of the Bible [2]

CHESIL (  Joshua 15:30 ). The LXX [Note: Septuagint.] reads Bethel , probably for Bethul , as in the parallel passage,   Joshua 19:4 , and Chesil of MT [Note: Massoretic Text.] is prob. a textual error.

Smith's Bible Dictionary [3]

Che'sil. (Idolatrous). A town in the extreme south of Palestine,  Joshua 15:30, 15 Miles southwest of Beersheba. In  Joshua 19:4, the name is Bethul .

Holman Bible Dictionary [4]

 Joshua 15:30 Joshua 19:4  Joshua 15:30  1 Chronicles 4:30Bethuel

Easton's Bible Dictionary [5]

 Joshua 15:30 1 Chronicles 4:30

Morrish Bible Dictionary [6]

City in the extreme south of Judah.  Joshua 15:30 .

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [7]

(Hebrews Kesil ´ , כְּסַיל , a Fool, i.e. profane, as in  Psalms 49:11, and elsewhere; Sept. Χεσίλ v. r. Χασείρ and Βαιθήλ ; Vulg. Cesil), a town in the extreme south of Palestine, named between Eltolad and Hormah ( Joshua 15:30). In the list of towns given out of Judah to Simeon, the name BETHUL (See Bethul) (q.v.) occurs in place of it ( Joshua 19:4), as if the one were identical with, or a corruption of, the other. This is confirmed by the reading of  1 Chronicles 4:30, BETHUEL; by that of the Sept. as given above, and by the mention in  1 Samuel 30:27, of a BETHEL among the cities of the extreme south. It is merely mentioned by Eusebius and Jerome in the Onomasticon (s.v. Χοιλή , Chisil). (See Urion).

International Standard Bible Encyclopedia [8]

kē´sil , kes´il ( כּסיל , keṣı̄l  ; A, Χασείρ , Chaseı́r ): A town in the extreme South of Judah named with Eltolad, Hormah and Ziklag ( Joshua 15:30 ). The name does not occur again. In  Joshua 19:4 it is replaced by Bethul (Septuagint Βαιθήλ , Baithḗl ), and in  1 Chronicles 4:30 by Bethuel. "Chesil" may have arisen from a misreading of the text.