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Dictionary of Medieval Names
from European Sources

Josaphat m. Hebrew יְהוֹשָׁפָט 'God has judged'.

The name of Biblical king of Judah and a legendary Indian martyr and saint. Wycliffite Bible (1395): Josaphat.

France
Middle French
1565 Josaphat RegPCC-1 p. 168
Cite as: S.L. Uckelman. "Josaphat". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 1. http://dmnes.org/2016/1/name/Josaphat.