Easton's Bible Dictionary (1897)
Firm. (1.) The fourth son of Simeon (Gen. 46:10), called also Jarib (1 Chr. 4:24). (2.) The head of one of the courses (the twenty-first) of priests (1 Chr. 24:17). (3.) One of the priests who returned from the Exile (1 Chr. 9:10).
Smith's Bible Dictionary (1863)
(he shall establish).
Hastings' Dictionary of the Bible (1898)
JA'CHIN (he shall establish). Fourth son of Simeon. Gen 46:10; Ex 6:15. Head of the twenty- first course of priests. 1 Chr 9:10; 1 Chr 24:17; Neh 11:10.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
JA'CHIN (he shall establish) and BOAZ (lively) were the names of the two pillars Solomon set up. They were probably named after the givers. See Boaz.
Hitchcock's Bible Names (1869)
he that strengthens and makes steadfast