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From Late Latin Mārciōn, from Koine Greek Μᾱρκῑ́ων (Mārkī́ōn, “Marky, little Mark, son of Mark”), from Ancient Greek Μᾶρκος (Mârkos) + -ίων (-íōn, “-son: forming patronymics”), from Latin Mārcus, from Mārs + -cus (“forming adjectives”), from Old Latin Māvors (“Mars, god of war”) and Proto-Indo-European *-kos (“forming desubstantival adjectives”).

(General American) IPA: /ˈmɑrʃiən/, /ˈmɑrʃən/, /ˈmɑrsiən/, enPR: märʹshē.ən, märʹshən, märʹsē.ən
(Received Pronunciation) IPA: /ˈmɑːʃiən/, /ˈmɑːʃən/, /ˈmɑːsiən/, enPR: mäʹshē.ən, mäʹshən, mäʹsē.ən

Marcion

From Koine Greek Μᾱρκῑ́ων (Mārkī́ōn, “Marky, little Mark, son of Mark”), from Ancient Greek Μᾶρκος (Mârkos) + -ίων (-íōn, “-son: forming patronymics”), from Latin Mārcus, from Mārs + -cus (“forming adjectives”), from Old Latin Māvors (“Mars, god of war”) and Proto-Indo-European *-kos (“forming desubstantival adjectives”).

Mārciōn m sg (genitive Mārciōnis); third declension

(Late Latin) Marcion, a diminutive of the male given name Mārcus, from Koine Greek, particularly (historical) Marcion of Sinope.

Third-declension noun, singular only.

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