Boyd’s Bible Dictionary:
(portion). (1) Mother of Amalek (Gen. 36:12). (2) A duke of Edom (Gen. 36:40), who gave his name to a boundary of Judah (Josh. 15:10). (3) A mountain town of Judah (Josh. 15:57).
Concise Bible Dictionary:
1. Duke descended from Esau (Gen. 36:40; 1 Chron. 1:51). Perhaps the same as TIMNA No. 3.
2. City on the north border of Judah (Josh. 15:10). Identified with ruins at Tibnah, 31° 45' N, 34° 56' E.
3. City in the south of Judah (Josh. 15:57; 2 Chron. 28:18). Identified with Tibna, 31° 42' N, 35° 2' E.
Jackson’s Dictionary of Scripture Proper Names:
thou wilt withhold : thou wilt number: a portion (Josh 15:10,57; 2 Chron. 28:18)