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

England

Latin

● 1222 Ysaac (nom) StPaulDom p. 101; 1279–80 Isak (nom) WaHR-SK p. 36

Dutch

● 1572 Isaac AuFr Bontenaken, Isaack ibid. Bogarts; 1574 Isaack ibid. Costere, Isack ibid. Dierecksen; 1576 Isaac ibid. Assendelft, Isaack ibid. Clerx; 1579 Isaac ibid. Engelgrave; 1581 Isaac ibid. Gast; 1583 Isaac ibid. Engelgrave; 1584 Isaac ibid. Brauwers; 1587 Isaac ibid. Brugge, Isaak ibid. Bogaerts; 1590 Isaack ibid. Cleijmans; 1591 Isaac ibid. Beun; 1592 Isaac ibid. Buen; 1593 Isaac ibid. Alaerts; 1594 Isaack ibid. Baert; 1596 Isaac ibid. Connick; 1597 Isaac ibid. Freschner; 1599 Isaac ibid. Clerck

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; 1591/2 Isaac ibid. p. 563

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