Sephardic Jews in the Netherlands of Sephardic Jewry in Amsterdam, the Mahamad also closely controlled the process of re-judaization - that is helping those whose families had been secretly living as Jews while being outwardly Catholic return to a full Jewish life. In this process, several individuals rejected Rabbinic Judaism or advanced ideas outside of the norms of Judaism at that time and were disciplined by the Mahamad through the process of herem, which could be anything from denial of Torah honors to an outright ban on the individual. The most famous of those to receive a full ban herem was philosopher Baruch Spinoza, whose
Sephardic Bnei Anusim the person is a Sephardic Ben/Bat Anusim or a newly reverted Neo-Western Sephardic Jew). Although it is true that a few surnames among those specifically mentioned above became popularly adopted by New Christians (including, most notably the surname Pérez, because of its similarity to the Hebrew surname Peretz), such popularly adopted surnames by New Christians remain Old Christian surnames in origin, and carrying these surnames does not by itself indicate Jewish ancestry. This phenomenon is much the same as is the situation with surnames which are typically considered to be Ashkenazi "Jewish" surnames. Most "Jewish" surnames among Ashkenazi Jews are