Kowalski
Kowalski (; feminine: Kowalska, plural: Kowalscy) is the second most common surname in Poland (140,471 people in 2009). ''Kowalski'' surname is derived from the word ''kowal'', meaning "[[Blacksmith|[black]smith]]"."Jan Kowalski" is used as a placeholder name in Poland to mean "John Smith", much as "John Doe" is used in English-speaking countries. Provided by Wikipedia
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