From earlier *-āsijos,[1][2] from *-āso- (from Proto-Indo-European*-eh₂so-, for which see also the Hittite appurtenance suffix -𒀸𒊭𒀸(-ašša-)), extended with the relational adjectival suffix *-yós(“belonging to”).[3]
^ Weiss, Michael L. (2009), Outline of the Historical and Comparative Grammar of Latin, Ann Arbor: Beech Stave Press, →ISBN, page 276: “*-āsii̯o-”
^ Fortson IV, Benjamin W. (2017), “Chapter VIII: Italic”, in Klein, Jared S., Joseph, Brian D., Fritz, Matthias, editors, Handbook of Comparative and Historical Indo-European Linguistics: An International Handbook (Handbücher zur Sprach- und Kommunikationswissenschaft [Handbooks of Linguistics and Communication Science]; 41.2), volume 2, Berlin; Boston: De Gruyter Mouton, →ISBN, § The dialectology of Italic, page 843: “*-āsii̯o-”
^ Miller, D. Gary (2006), Latin Suffixal Derivatives in English: and their Indo-European Ancestry, New York: Oxford University Press, →ISBN, pages 140–41: “*-ās-(i)yo-”
^ Buck, Carl Darling (1904), A Grammar of Oscan and Umbrian: With a Collection of Inscriptions and a Glossary[1], page 186: “*-āsi̯o-”
^ Poultney, James Wilson (1959), The Bronze Tables of Iguvium, Baltimore: American Philological Association, page 87: “*-āsyo-”
^ Wallace, Rex E. (2007), The Sabellic Languages of Ancient Italy, LINCOM, →ISBN, page 34: “*-(a)sio-”
^ Nishimura, Kanehiro (2017), “New Thoughts on Umbrian nuvime and Oscan maimas Syncope and Glide Treatment in Sabellic”, in Incontri linguistici[2], volume 40, Fabrizio Serra Editore, →DOI, page 98 of 93–106: “*-as-ii̯o- became (probably via *-asio- >) *-asi̯o-”
