Matrinus

Possibly related to the Celtic name of Matrona and Modron, but more likely from Proto-Indo-European *meh₂d- (“to be wet”) through a language that had a stop shift *d > t (Germanic, Hittite, Thracian).

• (Classical Latin) IPA^(key): [maˈtriː.nʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [maˈt̪riː.nus]

Matrīnus m sg (genitive Matrīnī); second declension

1. A river of Picenum flowing into the Adriatic Sea near the city of Hadria

Second-declension noun, singular only.

• “Matrinus”, in William Smith, editor (1854, 1857), A Dictionary of Greek and Roman Geography, volume 1 & 2, London: Walton and Maberly
• Matrinus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Pokorny, Julius, Indogermanisches Etymologisches Wörterbuch, Tübingen: A. Francke Verlag, 1959.