Hakkoz

A man, in the time of Exile and Return · named in 2 verses

Hakkoz was a priest whose descendants were unable to prove their priestly lineage after the Babylonian exile.

From Easton's Bible Dictionary

The thorn, the head of one of the courses of the priests (1 Chr. 24:10).

Easton's Illustrated Bible Dictionary, 1897 — public domain, quoted in full and unedited.

First named at Ezra 2:61.

Ezra 2:61 And from among the priests: the descendants of Hobaiah, the descendants of Hakkoz, and the descendants of Barzillai (who had married a daughter of Barzillai the Gileadite and was called by their name).
Nehemiah 7:63 And from among the priests: the descendants of Hobaiah, the descendants of Hakkoz, and the descendants of Barzillai (who had married a daughter of Barzillai the Gileadite and was called by their name).