Smith's Bible Dictionary
(dwellers in a thirsty land ),a nation mentioned as contributing, together with Cushites and Sukkiim, to Shishak's army, ( 2 Chronicles 12:3 ) and apparently as forming with Cushites the bulk of Zerah's army, (2 Chronicles 16:8 ) spoken of by Nahum, (Nahum 3:9 ) with Put or Phut, as helping No-amon (Thebes), of which Cush and Egypt were the strength. Upon the Egyptian monuments we find representations of a people called Rebu or Lebu, who correspond to the Lubim, and who may be placed on the African coast to the westward of Egypt, perhaps extending far beyond the Cyrenaica.
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Smith, William, Dr. Entry for 'lu'Bim'. Smith's Bible Dictionary. http://www.studylight.org/dictionaries/sbd/l/lubim.html. 1901.