Origin of name sanchez?

Sánchez is a common Spanish surname. As a patronymic, it means "son of Sancho". The name "Sancho" itself comes from the Basque Santxo, which comes from the Latin Sanctius (“saintly or holy”). The "-ez" suffix comes from the Latin genitive suffix -is of the third declension, originating as a calque of surname-formation conventions of the Visigoths.