Abigail gave birth to Amasa, and the father of Amasa was Jether the Ishmaelite.

The sons of Elkanah: Amasai and Ahimoth.

the son of Zuph, the son of Elkanah [II], the son of Mahath, the son of Amasai,

Then the [Holy] Spirit came on Amasai, who was chief of the thirty, and he said,“We are yours, O David,
And with you, O son of Jesse!
Peace, peace be to you,
And peace be to him who helps you;
For your God helps you.” Then David accepted and received them and made them officers of his troops.

Shebaniah, Joshaphat, Nethanel, Amasai, Zechariah, Benaiah, and Eliezer the priests blew the trumpets before the ark of God. Obed-edom and Jehiah (Jeiel) were also gatekeepers for the ark.