Perhaps taken fromAnatolian.

-ῑ́ων• (-ī́ōn) m orf (genitive-ῑ́ωνοςor-ῑ́ονος);third declension

1. (chiefly Epic)Suffix added to father's name that forms masculine patronymic, meaning "son of"

   ‎Πηλεύς(Pēleús,“Peleus”) + ‎-ίων(-íōn) → ‎Πηλεΐων(Pēleḯōn,“son of Peleus”)

• -ῐ́δης(-ĭ́dēs)

• -ιώνη(-iṓnē)
• -ῑ́νη(-ī́nē)

• Smyth, Herbert Weir (1920), “Part III: Formation of Words”, inA Greek grammar for colleges, Cambridge: American Book Company,§ 845

FromProto-Hellenic*-ihō, fromProto-Indo-European*-isō, from*-yōs (whence-ων(-ōn)).

-ῑ́ων• (-ī́ōn) m orf (neuter-ῑον);third declension

1. Suffix added to some adjectival stems to form acomparative adjective: -er

   ‎ἡδύς(hēdús,“sweet”) + ‎-ίων(-íōn) → ‎ἡδῑ́ων(hēdī́ōn,“sweeter”)

• Smyth, Herbert Weir (1920), “Part II: Inflection”, inA Greek grammar for colleges, Cambridge: American Book Company,§ 318

• Ancient Greek 2-syllable words
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• Epic Greek
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• Ancient Greek terms derived from Proto-Hellenic
• Ancient Greek terms inherited from Proto-Indo-European
• Ancient Greek adjective-forming suffixes

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