Dictionary of Medieval Names
from European Sources

Justus m. Latin justus 'just, fair'.

The byname of a Biblical character who was later venerated as a saint, a 2nd C pope and saint, a semi-legendary 3rd C saint, two 4th C martyrs, a 4th C French saint, and a 6th C Spanish saint. Wycliffite Bible (1395): Just.

This name is sometimes conflated with Josse, via spellings such as Jost.

France
Latin
814 Justus (nom) StVdM-II H1; 1301 Justus (nom) MemPic-vol17 p. 216
Old French
1292 Juste 1292paris p. 2; 1301 Justes (nom) MemPic-vol17 p. 236
Italy
Latin
1376 Iusto (abl) DouGen1 p. 161
Cite as: J. Uckelman, S.L. Uckelman. "Justus". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Justus.