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Cognomen Tahmasebi (Tahmasebi
, Тахмасеби
, طهماسبی
) , across the world, is quite a rare family name. The cognomen Tahmasebi is habitual in Iran, where it is quite a rare surname, Sweden, where it is a rare surname, and United Arab Emirates. Measured by absolute frequency, it is the most numerous in Iran, the United States, and Sweden.