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Dictionary of Medieval Names
from European Sources
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Isaiah m. Ancient Greek Ἠσαΐας from Hebrew יְשַׁעְיָהוּ 'Yahweh is salvation'.

The name of an Old Testament prophet, an 8th C Catholicos of Armenia, and an 11th C Russian saint. Wycliffite Bible (1395): Isaie, Ysaie.

England
Walloon
● 1582/3 Esaye RWC p. 5; 1583 Esaye ibid. p. 6; 1590 Esaye ibid. p. 441; 1590/1 Isay ibid. p. 15; 1591/2 Esaie ibid. p. 19; 1591 Isaie ibid. p. 17; 1592 Esaie ibid. p. 22; 1593 Esaie ibid. p. 27, Esaye ibid. p. 564, Isaie ibid. p. 29; 1594 Esaie ibid. p. 32, Esaye ibid. p. 32, Isaie ibid. p. 33
◑ 1581 Isaiet RWC p. 562
France
Middle French
● 1560 Isaïe RegPCC-1 p. 1; 1561 Esaïe ibid. p. 5; 1564 Ysaye ibid. p. 56; 1566 Esaye ibid. p. 208; 1567 Esaye ibid. p. 322; 1570 Esaïe ibid. p. 431
Poland
Latin
● 1209 Isaias (nom) CDT1 II
Cite as: S.L. Uckelman. "Isaiah". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Isaiah.