Barzillai in the Bible

1. A friend of David

2 Samuel 17:27-29 And it came to pass, when David was come to Mahanaim, that Shobi the son of Nahash of Rabbah of the children of Ammon, and Machir the son of Ammiel of Lodebar, and Barzillai the Gileadite of Rogelim, 28 Brought beds, and basons, and earthen vessels, and wheat, and barley, and flour, and parched corn, and beans, and lentiles, and parched pulse, 29 And honey, and butter, and sheep, and cheese of kine, for David, and for the people that were with him, to eat: for they said, The people is hungry, and weary, and thirsty, in the wilderness.
2 Samuel 19:31-39 And Barzillai the Gileadite came down from Rogelim, and went over Jordan with the king, to conduct him over Jordan. 32 Now Barzillai was a very aged man, even fourscore years old: and he had provided the king of sustenance while he lay at Mahanaim; for he was a very great man. 33 And the king said unto Barzillai, Come thou over with me, and I will feed thee with me in Jerusalem. 34 And Barzillai said unto the king, How long have I to live, that I should go up with the king unto Jerusalem? ...
1 Kings 2:7 But shew kindness unto the sons of Barzillai the Gileadite, and let them be of those that eat at thy table: for so they came to me when I fled because of Absalom thy brother.
Ezra 2:61 And of the children of the priests: the children of Habaiah, the children of Koz, the children of Barzillai; which took a wife of the daughters of Barzillai the Gileadite, and was called after their name:
Nehemiah 7:63 And of the priests: the children of Habaiah, the children of Koz, the children of Barzillai, which took one of the daughters of Barzillai the Gileadite to wife, and was called after their name.

⇒Bible Encyclopedia for BARZILLAI.

2. Father of Adriel

2 Samuel 21:8 But the king took the two sons of Rizpah the daughter of Aiah, whom she bare unto Saul, Armoni and Mephibosheth; and the five sons of Michal the daughter of Saul, whom she brought up for Adriel the son of Barzillai the Meholathite:

3. A priest

Ezra 2:61 And of the children of the priests: the children of Habaiah, the children of Koz, the children of Barzillai; which took a wife of the daughters of Barzillai the Gileadite, and was called after their name:
Nehemiah 7:63 And of the priests: the children of Habaiah, the children of Koz, the children of Barzillai, which took one of the daughters of Barzillai the Gileadite to wife, and was called after their name.