Common Ashkenazi Jewish surnames often include:
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Occupational names: Goldschmidt, Schneider, Weber, Kaufmann
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Place names: Berliner, Frankfurter, Wiener, Breslauer
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Patronymics: Jacobson, Levinson, Davidson
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Acronyms/abbreviations: Katz (Kohen Tzedek), Segal, Bloch
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Ornamental/compound names: Rosenberg, Goldstein, Silverman, Rothstein
Surnames common among Sephardic Jews include: Cohen, Levy, Mizrahi, Azoulay, Abarbanel, Benveniste.
Important caveats:
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A surname alone is not proof of Jewish ancestry. Many “Jewish-sounding” names are shared by non-Jews, and many Jews have names that don’t sound Jewish at all.
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Surnames were often imposed or changed — through migration, persecution, translation, or voluntary assimilation.
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DNA testing and genealogical records are far more reliable than surname lists.