Dictionary of Medieval Names
from European Sources

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

The name of a Biblical patriarch. Wycliffite Bible (1395): Isaac. Sagradas Escrituras (1569): Isaac.

Belgium
Latin
1066 Isaac (gen) CartSPL1 II
Middle Dutch
1486 Isaac (nom) MPSA p. 53; 1489 Isaac (nom) ibid. p. 54
Dutch
1500 Isaac MPSA p. 58; 1502 Isaac ibid. p. 58; 1507 Isaac ibid. p. 51 [sic]; 1519 Isaac ibid. p. 56 [sic]
England
Latin
1222 Ysaac (nom) StPaulDom p. 101; 1279–80 Isak (nom) WaHR-SK p. 36
Dutch
1572 Isaac AuFr Bontenaken, Isaack ibid. Bogarts; 1573 Isaac ibid. Lamberts; 1574 Isaack ibid. Costere, Isack ibid. Dierecksen; 1575 Isaac ibid. Kunicx; 1576 Isaac ibid. Assendelft, Isaack ibid. Clerx; 1577 Isaac ibid. Ro, Isaack ibid. Seghers; 1579 Isaac ibid. Engelgrave; 1580 Isaac ibid. Luls; 1581 Isaac ibid. Gast; 1582 Isaac ibid. Quinckens; 1583 Isaac ibid. Engelgrave; 1584 Isaac ibid. Brauwers; 1585 Isaac ibid. Vos; 1586 Isaac ibid. Wijnghe, Isaak ibid. Gouch; 1587 Isaac ibid. Brugge, Isaak ibid. Bogaerts; 1589 Isaac ibid. Ruijster; 1590 Isaac ibid. Keij, Isaack ibid. Cleijmans; 1591 Isaac ibid. Beun; 1592 Isaac ibid. Buen, Isaack ibid. p. 84; 1593 Isaac ibid. Alaerts; 1594 Isaac ibid. Godschalck, Isaack ibid. Baert; 1595 Isaac ibid. Hulster, Isaack ibid. Stalpart; 1596 Isaac ibid. Connick; 1597 Isaac ibid. Freschner; 1598 Isaac ibid. Reijnisch; 1599 Isaac ibid. Clerck
Early Modern English
1583/4 Isacke SurMus p. 62; 1584 Isacke bruton1 p. 115; 1586 Isack RegSoAMar p. 12; 1589/90 Isaake HWCP2 p. 5
Middle French
1568 Isaac WCS p. 39; 1573 Isacq ibid. p. 41; 1575 Isac ibid. p. 42; 1579 Isaac ibid. p. 44; 1580 Isaac ibid. p. 15, Isac ibid. p. 45; 1581 Isaac ibid. p. 16; 1582 Isaac ibid. p. 45, isac ibid. p. 46; 1583 isaac ibid. p. 46; 1584 Isaac ibid. p. 18; 1585 Isaac ibid. p. 46; 1586 Isaac ibid. p. 47; 1587 Isaac ibid. p. 21; 1588 Isaac ibid. p. 47; 1589 Isaac ibid. p. 22; 1590 Isaac ibid. p. 49; 1591 Isaac ibid. p. 49; 1592 Isaac ibid. p. 49; 1593 Isaac ibid. p. 25; 1594 Isaac ibid. p. 51; 1595 Isaac ibid. p. 25; 1596 Isaac ibid. p. 26, Isäac ibid. p. 26; 1597 Isaac ibid. p. 52; 1598 Isaac ibid. p. 52; 1599 Isaac ibid. p. 53
Walloon
1581/2 Isaac RWC p. 4; 1582 Isaac ibid. p. 4; 1582/3 Isaac ibid. p. 5; 1583/4 Isaac ibid. p. 437; 1583 Isaac ibid. p. 6; 1584 Isaac ibid. p. 437; 1590 Isaac ibid. p. 14; 1591 Isaac ibid. p. 16; 1591/2 Isaac ibid. p. 563; 1591 Isac ibid. p. 18; 1592 Isaac ibid. p. 24; 1592/3 Isaac ibid. p. 25; 1593 Isaac ibid. p. 26; 1593/4 Isaac ibid. p. 31; 1594 Isaac ibid. p. 32
Finland
Early Modern Swedish
1582 Isack (nom) Audén1980 p. 171
France
Latin
1378 Ysaco (dat) hanquetvol1 1169
Middle French
1562 Isaac RegPCC-1 p. 14; 1563 Isaac ibid. p. 24; 1564 Isaac ibid. p. 55, Ysaac ibid. p. 90; 1565 Isaac ibid. p. 189, Ysaac ibid. p. 163; 1566 Isaac ibid. p. 215, Ysaac ibid. p. 218; 1567 Isaac ibid. p. 292, Ysaac ibid. p. 328; 1568 Isaac ibid. p. 373, Ysaac ibid. p. 374; 1570 Isaac ibid. p. 426; 1571 Isaac ibid. p. 482; 1572 Esaac ibid. p. 514, Isaac ibid. p. 517
Germany
Latin
891 Ysaac (nom) UrkStyria 10
Hungary
Latin
1323 Isaak Slíz p. 173, s.n. Isaak; 1330 Isaak ibid. p. 173, s.n. Isaak; 1331 Isak ibid. p. 173, s.n. Isaak; 1332x1337 Ysaak (nom) ibid. p. 173, s.n. Isaak; 1341 Isaak ibid. p. 173, s.n. Isaak
Ireland
Latin
fin12thC Isaac (nom) MunDocIr III, p. 17
Italy
Latin
1237 Ysaki (gen) TirNot1 584; 1527 Jsach (nom) Rome1527 p. 87
1285 Ysacutii (gen) Perugia1285 p. 154
Scotland
Latin
1238 Ysaaco (abl) CartLevenax p. 13
Sweden
Old Swedish
1419 Ysaak (nom) SDHK no. 19242, Ysak (gen) ibid. no. 19242
Switzerland
Latin
1188 Ysaac (nom) CartHaut 28
Cite as: R. Le Get, M. Slíz, S.L. Uckelman. "Isaac". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2020, no. 1. http://dmnes.org/2020/1/name/Isaac.