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Cognomen Kaczyński (Kaczynski
, Kaczyński
, Kachinsky
) , in all the world, is quite a common family name. The cognomen Kaczyński is habitual in Poland, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Ireland, where it is a rare surname. In absolute terms, it is commonest in Poland, the United States, and Germany. Likewise, Kaczyński is the forename as well as the last name.
Jan, Tomek, Filip, Oskar, Witek, Marian, Martin, Marcin, Maciej, Maciek, Stefan, Szymon, Adrian, Bartek, Kacper, Konrad, Patryk, Robert, Daniel, Damian, Donald, Leszek, Jerzy, Jakub, Jarek, Jacek, Arek, Adam, Kuba, Lech, Eryk, Emil, Igor, Marek, Mirek, Artur, Janusz, Karol, Pawel, Paweł, Piotr, Radek, Rafał, Romek, Roman, Darek, Dawid, Janek, Kamil, and Józef