Portnyagin (), feminine: Portnyagina, is a Russian surname derived from the occupation of portnyaga, portnoy, meaning tailor. A variant of this surname is Pontryagin, explained the selectivity of the mutual positions of consonants in Russian language., Словарь русских фамилий [Dictionary of Russian Surnames], p. 95
Notable people with the surname include: Igor Portnyagin (born 1989), Russian football player Paul Portnyagin (1903–1977), Russian Greek-Catholic priest, teacher and orientalist
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