Lewis & Short

2. Aesis, is, f., a town in Umbria on the river Æsis: COL. AESIS, Inscr. Orell. 3899.
Whence,

  1. I. Aesinas, ātis, adj., of or pertaining to Æsis: caseus, Plin. 11, 42, 97, § 241.
  2. II. Aesinātes, ium, m., the inhabitants of Æsis, Plin. 3, 14, 19, § 113.