Brother of liberality = liberal, one of the twelve commissariat officers appointed by Solomon in so many districts of his kingdom to raise supplies by monthly rotation for his household. He was appointed to the district of Mahanaim (1 Kings 4:14), east of Jordan.
Easton’s Bible Dictionary
Ahinadab
Name meaninga willing brother; brother of a vow
Easton’s Bible Dictionary (1897), public domain. Text via Theographic Bible Metadata, CC BY-SA 4.0.