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Dictionary of Medieval Names
from European Sources

Isaac m. Hebrew יִצְחָק '[he] will laugh'.

The name of a Biblical patriarch. Wycliffite Bible (1395): Isaac.

England
Latin
1279–80 Isak (nom) WaHR-SK p. 36
Finland
Early Modern Swedish
1582 Isack (nom) Audén1980 p. 171
France
Latin
1378 Ysaco (dat) hanquetvol1 1169
Ireland
Latin
fin12thC Isaac (nom) MunDocIr III, p. 17
Italy
Latin
1527 Jsach (nom) Rome1527 p. 87
1285 Ysacutii (gen) Perugia1285 p. 154
Scotland
Latin
1238 Ysaaco (abl) CartLevenax p. 13
Switzerland
Latin
1188 Ysaac (nom) CartHaut 28
Cite as: R. Le Get, S.L. Uckelman. "Isaac". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 3. http://dmnes.org/2015/3/name/Isaac.