Smith's Dictionary
(booth-dwellers), a nation mentioned (2 Chronicles 12:3) with the Lubim and Cushim as supplying part of the army which came with Shishak out of Egypt when he invaded Judah. The Sukkiim may correspond to some one of the shepherd or wandering races mentioned on the Egyptian monuments.
International Standard Bible Encyclopedia
suk'-i-im (cukkiyim): Named in 2Ch 12:3 as a tribe that took part with Libyans and Cretans in the invasion of Judea by Shishak. The identification is uncertain.