Nombre. Aparece como Oyardo en documento de 1257 citado en Revista de Archivos.. de los años 1907 a 1909. El apellido del mismo nombre aparece como Oyardu en documento de 1566; Oyardo en documento del s. XIX. Ref. Gerardo López de Guereñu, Boletín de la Institución Sancho el Sabio 1969 p. 59.
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