A surname of Athena, under which she was worshipped in Megara. (Paus. i. 5. § 3; 41. § 6; Lycophr. Cass. 359.) The word aithuia signifies a diver, and figuratively a ship, so that the name must have reference to the goddess teaching the art of ship-building or navigation. (Tzetz. ad Lycophr. l. c.)