In Polish culture, Jan Kowalski is a placeholder name for an average Polish person, the meaning being similar to "Average Joe".
The surname Kowalski/Kowalska is the second most common surname in Poland (140,471 people in 2009), with the leader being Nowak (207,348 in 2009).[1]
The name is close to John Smith, both in translation and in the metonymic meaning of averageness,[2][3] although a more literal translation would be "John Smithson", as -ski is a patronymic suffix in Polish-language surnames. Analogous names in other languages include Jean Lefèvre, Giovanni Ferrari, Ivan Kuznetsov, Sean McGowan, Hans Schmidt, Kovács János, etc.[4]