Fausset's Bible Dictionary
Arab tradition confirms Genesis 10:26-29 in making Joktan (Kahtan) the great progenitor of all the pure tribes of central and southern Arabia. Thus Almodad equates to the Arabic Elmudad; Sheleph equates to Es-Sulaf in the Yemen; Hazarmaveth equates to Hadramaut on the S.E. coast of Arabia; Diklah equates to Dakalah, an important city in the Yemen; it means a fruit-abounding palm tree.
Holman Bible Dictionary
(dihk' lah) Personal name apparently meaning, “date palm.” Grandson of Eber (Genesis 10:27 ). He was apparently the original ancestor of a tribe in Arabia which settled in an oasis where dates were grown, but nothing more is known of him.
Hitchcock's Bible Names
Morrish Bible Dictionary
Son of Joktan of the family of Shem,whose descendants settled in Arabia. Genesis 10:27 ; 1 Chronicles 1:21 .
American Tract Society Bible Dictionary
A tribe descended from Joktan, Genesis 10:27 , and dwelling in Southern Arabia, or perhaps near the head of the Persian gulf.
Hastings' Dictionary of the Bible
DIKLAH . The name of a son of Joktan ( Genesis 10:27 , 1 Chronicles 1:21 ), probably representing a nation or community. The names immediately preceding and following Diklah give no clue to its identification.