Mencía is from the Basque mendi (mountain). **Mencía López de Haro (c. 1215-1270)** was the Castilian noblewoman who became **Queen of Portugal** through her marriage to Sancho II. The name was widely used among medieval Castilian nobility.
Featured in Tirso de Molina's tragedy El infanzón de Illescas.
Mencía reduces to six — the number of Castilian noble.