Jether

also called Ithra · An Ishmaelite, in the time of the United Monarchy · Arabia · named in 4 verses

Jether, also known as Ithra, was an Ishmaelite and the father of Amasa, who was Absalom's commander and later killed by Joab.

From Easton's Bible Dictionary

Surplus; excellence. (1.) Father-in-law of Moses (Ex. 4:18 marg.), called elsewhere Jethro (q.v.).

Easton's Illustrated Bible Dictionary, 1897 — public domain, quoted in full and unedited.

Partners Abigail

Children Amasa

From STEPBible's TIPNR genealogy data. A relationship the data marks uncertain is not shown here.

First named at 2 Samuel 17:25.

2 Samuel 17:25 Absalom had appointed Amasa over the army in place of Joab. Amasa was the son of a man named Ithra, the Ishmaelite who had married Abigail, the daughter of Nahash and sister of Zeruiah the mother of Joab.
1 Kings 2:5 Moreover, you know what Joab son of Zeruiah did to me—what he did to Abner son of Ner and Amasa son of Jether, the two commanders of the armies of Israel. He killed them in peacetime to avenge the blood of war. He stained with the blood of war the belt around his waist and the sandals on his feet.
1 Kings 2:32 The LORD will bring his bloodshed back upon his own head, for without the knowledge of my father David he struck down two men more righteous and better than he when he put to the sword Abner son of Ner, commander of Israel’s army, and Amasa son of Jether, commander of Judah’s army.
1 Chronicles 2:17 Abigail was the mother of Amasa, whose father was Jether the Ishmaelite.