Last name Sergeĭ (Сергей 
, Sergeĭ) , around the world, is a widespread cognomen. The family name Sergeĭ is characteristic of Armenia, where it is a common surname, Kyrgyzstan, and Moldova (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Russia, Kyrgyzstan, and Belarus. Predominantly, Sergeĭ is the forename as well as the last name.