Sephardi Jews legal residence in Spain, whatever their [current] ideology, religion or beliefs. Eligibility criteria for proving Sephardic descent include: a certificate issued by the Federation of Jewish Communities of Spain, or the production of a certificate from the competent rabbinic authority, legally recognized in the country of habitual residence of the applicant, or other documentation which might be considered appropriate for this purpose; or by justifying one's inclusion as a Sephardic descendant, or a direct descendant of persons included in the list of protected Sephardic families in Spain referred to in the Decree-Law of 29 December 1948, or descendants of those
Sephardic Bnei Anusim Jews during the 15th century. Surnames known to have been carried by Jews included Pérez, López, Salazar, Córdova, Torres, Castro, Álvarez, González, Gómez, Fernández. It is extremely important to note, however, that all of these mentioned surnames, and almost all other surnames which were carried by 15th century Sephardim, were never specifically Jewish in origin, that is, they were never exclusively "Sephardic surnames", if such a thing exists other than in the most rarest and limited of cases. Almost all these surnames are in fact surnames of gentile Spanish origin (or gentile Portuguese origin) which only became common among Sephardic