Cognomen Nadtoka (Nadtoka 
) , throughout the world, is a very rare family name. The cognomen Nadtoka is characteristic of Eastern Europe, particularly Czechia, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Russia, Czechia, and the United States.