 Koldo Mitxelena and modern form "senide" = 'brother or sister', 'relative').The explanation by the Biblical name Šim’ōn (Simon) is less convincing.Some think the name may be a corruption of the later part of the Latin name "Ma-ximinus", as there are late Classic records that various individuals with this name were becoming very active as officials and residents in upper Hispania near the Pyrenees and Tarraconensis during the last century of the Western Roman Empire, and perhaps into the period of transition from imperial province to independent Kingdom during Visigothic rule.