Didacus

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 διδαχή (didakhḗ), perhaps by conflation with διάδοχος (diádokhos); an extension of Latin Didus, Didius (masculine form of Dido) with the Basque suffix -ko-; a Celtic *Divakos, from *deiwos "god"; derivation from Celtiberian Titiacus, from a presumed *Tritiakos. Vernacular forms Diaco, Diago by the 10th century, the form Diego is recorded from the late 11th century.

• (Proto-Ibero-Romance) IPA^(key): /ˈdiðaɡu/ (Dīdacum)

Dīdacus m sg (genitive Dīdacī); second declension (Early Medieval Latin)

1. a male given name

Second-declension noun, singular only.

• Didacopolis

• → Catalan: Dídac
• Spanish: Diego
• Portuguese: Diogo

• Lidia Becker, Hispano-romanisches Namenbuch: Untersuchung der Personennamen vorrömischer, griechischer und lateinisch-romanischer Etymologie auf der Iberischen Halbinsel im Mittelalter (6.-12. Jahrhundert), Walter de Gruyter (2009), 385–389.