Jachin (jakzn). [Heb. Yakin, "he establishes." The name occurs also in Phoenician, and in Assyrian it is spelled Yakinu.]
1. Son of Simeon, and founder of a tribal family, the Jachinites (jakzn- ts) [Heb. Yakini] (Gen 46:10; Ex 6:15; Num 26:12). He is apparently called Jarib in 1 Chr 4:24.
2. A descendant of Aaron. His family formed the 21st of the 24 courses into which David organized the priests (1 Chr 24:17). Representatives of this family are also mentioned in ch 9:10 and in Neh 11:10.
3. The name of the right-hand pillar set up in the porch of Solomon's Temple (1 Ki 7:15-22; 2 Chr 3:17). It has not definitely been explained why the pillar was named Jachin, but there is a probability that the name was an abbreviation of an inscription engraved on it. An analogy may be seen in a pillar discovered in the temple of Sirwaih in Arabia on which the word knt, "strength," was engraved -- Seventh-day Adventist Bible Dictionary.