|Easton's Bible Dictionary|
Uprightness, the first of the three sons of Caleb by Azubah (1 Chronicles 2:18).
Int. Standard Bible Encyclopedia
je'-sher (yesher, or yesher, "uprightness"): A son of Caleb (1 Chronicles 2:18).
Jesher (1 Occurrence)
1 Chronicles 2:18 Caleb the son of Hezron became the father of children of Azubah his wife, and of Jerioth; and these were her sons: Jesher, and Shobab, and Ardon. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)