Onan [Ŏ'nan]—strong or pain. Second son of Judah, by the daughter of Shua the Canaanite. The method he adopted to evade the object of his marriage with his brother’s widow was evil in God’s sight, and He slew him (Gen. 38:4, 8, 9; 46:12; Num. 26:19; 1 Chron. 2:3).