LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Matius

Matius m sg (genitive Matiī or Matī)
Classical[ˈma.ti.ʊs]Ecclesiastical[ˈmat.t͡si.us]

Meaning

  1. masculinesingulara Roman nomen gentile, gens or "family name" famously held by
  2. masculinesingularGaius Matius, a Roman writer

Declension

declension
formsingularplural
nominativeMatius—
genitiveMatiī
Matī		—
dativeMatiō—
accusativeMatium—
ablativeMatiō—
vocativeMatī—

Mătĭus, a,
I. the name of a Roman gens. So, Cn. Matius, a poet and translator of the Iliad, Gell. 6, 6, 5; 9, 14, 14; Varr. L. L. 7, 5, § 96 Müll.; perh. the same with C. Matius, a friend of Cæsar and Cicero, Cic. Fam. 6, 12, 2; 7, 15; 11, 28; Plin. 12, 2, 6, § 13; Col. 12, 4, 2 al.—Hence,
II. Mătĭā-nus, a, um, adj., of or belonging to a Matius, Matian: mala, a kind of apple, Col. 5, 10, 19; 12, 47, 5; Suet. Dom. 21: poma, Front. de Fer. Als. 3; Minutal, Apic. 4, 3.

Origins

Possibly of Celtic/Gaulish origin, from Proto-Celtic *matis (“good”). Delamarre likewise analyzes related Celtic names such as Maticus from the same root.

Quick answers

What does Matius mean in Latin?
Matius, a proper noun, means “a Roman nomen gentile, gens or "family name" famously held by”.
What is the genitive of Matius?
The genitive singular is Matiī. Matius is masculine, second declension.
How do you pronounce Matius?
In classical Latin, [ˈma.ti.ʊs]; in ecclesiastical (church) Latin, [ˈmat.t͡si.us].