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Dictionary of Medieval Names
from European Sources

Theresa f. Of uncertain origin, but possibly from Greek θερίζω 'to harvest'.

The name of a 12th-13th C Portuguese saint and queen of Leon, and a 16th C Spanish saint.

The name did not spread outside of the Iberian peninsula until the 16th century, with the veneration of Saint Theresa of Avila.

Spain
Catalan
1510 Tareza valencia1510 4303, Teresa ibid. 4162
Spanish
1319 Tareisa deMoxo, Teresa ibid.; 1328 Tereysa ibid.; 1332 Tereysa ibid.; 1334 Teresa ibid.; 1336 Tereysa ibid.; 1348 Tereysa ibid.; 1496 Theresa olite1496 p. 185
Cite as: S.L. Uckelman. "Theresa". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Theresa.