“Jachin” means he shall establish

1. One of the two pillars which were set up "in the porch," (1 Kings 7:21) or before the temple. (2 Chronicles 3:17) of Solomon. [BOAZ]
2. Fourth son of Simeon, (Genesis 46:10; Exodus 6:15) founder of the family of the Jachinites. (Numbers 26:12)
3. Head of the twenty-first course of priests in the time of David. (1 Chronicles 9:10; 24:17; Nehemiah 11:10)