Cognomen Rybko (Rybko 
, Рыбко 
) , globally, is a rare surname. The last name Rybko is characteristic of Belarus, where it is quite a rare surname, Russia, where it is a rare surname, and Lithuania. Not in comparison with a country's population, it is the most numerous in Russia, Belarus, and Kazakhstan. Much less frequently, Rybko is the forename as well as the last name.