Dictionary of Medieval Names
from European Sources

Martio m. Latin Martius 'March', a derivative of Mars, the name of the God of war, or Marcius, the name of a Roman gens also deriving from Mars.

Italy
Latin
1527 Martutius (nom) Rome1527 p. 87
Cite as: S.L. Uckelman. "Martio". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Martio.