Didacus

Etymology
An exclusively Iberian name recorded from the mid-8th century, and frequently throughout the 9th century, predominantly in northwestern Iberia.

Of unknown origin. Suggestions have included: a masculine derivation from Greek, perhaps by conflation with ; an extension of Latin Didus, Didius (masculine form of ) with the Basque suffix -ko-; a Celtic *Divakos, from "god"; derivation from Celtiberian Titiacus, from a presumed *Tritiakos. Vernacular forms Diaco, Diago by the 10th century, the form is recorded from the late 11th century.