Easton's Bible Dictionary (1897)
(another form of Jacob). (1.) The head of one of the families of Nethinim (Ezra 2:45). (2.) A Levite who kept the gate of the temple after the return from Babylon (1 Chr. 9:17; Ezra 2:42; Neh. 7:45). (3.) A descendant of David (1 Chr. 3:24).
Smith's Bible Dictionary (1863)
(insidious).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
AK'KUB (insidious). 1. A descendant of David. 1 Chr 3:24. One of the porters at the east gate of the temple. 1 Chr 9:17; Ezr 2:42; Neh 7:45; Neh 11:19; Neh 12:25. One of the Nethinim whose family returned with Zurubbabel. Ezr 2:45. A Levite who assisted Ezra in explaining the law. Neh 8:7.
Hitchcock's Bible Names (1869)
foot-print; supplanting; crookedness; lewdness