JACHIN jā’ kĭn (יָכִ֣ין, He shall establish). 1. The fourth son of Simeon and head of the Jachinite tribe (Gen 46:10; Exod 6:15; Num 26:12; Jarib in 1 Chron 4:24).

2. One of the priests who lived in Jerusalem after the Exile (1 Chron 9:10; Neh 11:10). It is possible, however, that the name may here be used as a family name denoting the priests in the twenty-first course, or the course of which Jachin was the head. In a list of six priests (1 Chron 9:10-13), three of them have names that may be found in the list of courses (24:17) and two of the remaining names (Adaiah and Maasai) are carefully traced back to ancestors who were the heads of courses.

3. The head of the twenty-first course of priests (1 Chron 24:17).