This page is historical. Follow this link for the current version.
Dictionary of Medieval Names
from European Sources

Marianus m. A derivative of Latin Marius.

The name is sometimes treated as a masc. of Mariana (cf. Mary and Mary-Anne). In the early Christian era, Marianus was also treated as an adjective meaning 'of Mary'.

Italy
Latin
1522x1532 Marianus (nom) DSF p. 52, 30; 1527 Mariani (gen) Rome1527 p. 89
Cite as: S.L. Uckelman. "Marianus". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Marianus.