|Noah Webster's Dictionary|
(n.) A contraction of cousin.
Int. Standard Bible Encyclopedia
koz (kots, "thorn"): A man of Judah (1 Chronicles 4:8). the American Standard Revised Version has added the article, making the name Hakkoz without sufficient reason. The name occurs with the article (Ha-qots) in Ezra 2:61 Nehemiah 3:4, 21; Nehemiah 7:63, and 1 Chronicles 24:10, but not with reference to the same person. Coz was of the tribe of Judah, while Hakkoz belonged to the family of Aaron.
Coz (1 Occurrence)
1 Chronicles 4:8 And Coz begat Anub, and Zobebah, and the families of Aharhel the son of Harum. (KJV WBS YLT)