Barzillai

A man, in the time of Exile and Return · named in 2 verses

the name means iron-hearted Strong's Lexicon

The descendants of Barzillai were a priestly family who returned from Babylonian exile but could not prove their lineage.

From Easton's Bible Dictionary

Of iron. (1.) A Meholathite, the father of Adriel (2 Sam. 21:8).

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

First named at Ezra 2:61.

Ezra 2:61 And from among the priests: the descendants of Hobaiah, the descendants of Hakkoz, and the descendants of Barzillai (who had married a daughter of Barzillai the Gileadite and was called by their name).
Nehemiah 7:63 And from among the priests: the descendants of Hobaiah, the descendants of Hakkoz, and the descendants of Barzillai (who had married a daughter of Barzillai the Gileadite and was called by their name).