Mary Boyce speaks of several lands and individuals who are not Aryan in the Avesta (Farvardeen Yasht) that are venerated. One of them in particular is Aghvi. But I think I"m transliterating the name wrong. Could he be the Aghuyu?
118. We worship the Fravashi of the holy
Hugau. We worship the Fravashi of the
holy Anghuyu. We worship the Fravashi of
the holy Gauri; We worship the Fravashi of the holy Yushta, the son of Gauri
[or, the holy Gaorayana]. We worship the
Fravashi of the holy Mazdra-vanghu; We worship the Fravashi of the holy
Srira-vanghu. We worship the Fravashi of
the holy Ayuta. We worship the Fravashi
of the holy Suro-yazata. – Farvardeen Yasht 30.118