Бану Каси
It has been speculated, on the basis of onomastics and geography, that Fortún was a relative of the Banu Qasi, a "muwallad" clan that was once the third power in Spain, and that his position in the Rioja may have derived from this connexion. The Banu Qasi leader Musa ibn Musa, the "third king of Spain" ("tercer rey de España"), had two sons who were both rulers in the Rioja in the late ninth century: Lubb ibn Musa in Viguer and Arnedo and Fortún ibn Musa in Tudela. Lubb is just the Arabic version of Lope (and thus Ochoa). Both of Fortún Ochoiz's names were current in the last generation of the Banu Qasi then ruling La Rioja.