A personal name meaning 'my brother is noble/willing,' from ach and nadab (willing/noble). One of Solomon's twelve district governors, over Mahanaim.
Achiynadab governed Mahanaim (1 Kings 4:14) -- a city rich with covenant history (Jacob's angels, David's refuge). The root nadab means voluntary/generous. Freewill offerings characterize those who serve willingly (Psalm 110:3; 2 Corinthians 9:7).