Olszewski (feminine Olszewska, plural Olszewscy, alternative Olszowski) is a Polish surname. The Russian-language version is Olshevsky, feminine: Olshevskaya. The Lithuanian language forms are Olšauskas and Alšauskas, feminine: Olšauskienė/Alšauskienė (married), and Olšauskaitė/Alšauskaitė (unmarried). Belarusian form: Альшэўскі (Alsheuski or Alshewski).

Origin could be derived from Polish word olsza or olcha, which means alder tree.[1]

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  1. ^ "Surname Saturday – Olszewski – Al's Polish-American Genealogy Research".