Boyd’s Bible Dictionary:
(number). A Joktenite border in Arabia (Gen. 10:30).
Concise Bible Dictionary:
A mountainous district, the boundary of the descendants of Joktan (Gen. 10:30). Probably Dhafar (pronounced Zafar) or Dhafari (pronounced Zafari) in Hadramaut, part of Southern Arabia.
Strong’s Dictionary of Hebrew Words:
Meaning:
the same as 5610; Sephar, a place in Arabia
Jackson’s Dictionary of Scripture Proper Names:
enumeration: census
Potts’ Bible Proper Names:
Conspicuous; numbering; census:―a place in Arabia, Gen. 10:30. {Conspicuus}