Hakkoz
Easton's Dictionary
The thorn, the head of one of the courses of the priests (1 Chr. 24:10).
Smith's Dictionary
(thorn), a priest, the chief of the seventh course in the service of the sanctuary, as appointed by David. (1 Chronicles 24:10) In (Ezra 2:61) and Nehe 3:4,21 The name occurs again as Koz in the Authorized Version.
International Standard Bible Encyclopedia
hak'-oz (haqqots, or ha-qots, "the nimble"):
(1) A priest and chief of the 7th course of Aaron's sons selected by David (1Ch 24:10). According to Ezr 2:61; Ne 3:4,21; 7:63, his descendants returned with Zerubbabel from the captivity. But the King James Version considers the name in Ezra and Nehemiah as having the article prefixed, hence renders "Koz."