Ἀόνιος
Ἀόνιος, of Aonia, Boeotia
Could not find Ἀονίοισιν in Logeion dictionaries.
Ἀονίοισιν Proper-name adjective: masculine dative plural, Proper-name adjective: neuter dative plural of Ἀόνιος
aonio, beocio ét. de Aonia, A.R.3.1178,
πεδία
Ἀόνιος, α (ion. -η), ον [ᾱ] d’Aonie, A. Rh. 3, 1178, etc. ; Nonn. D. 5, 66, etc.