Cognomen Oleksii (Алексей 
, Олексій 
, Oleksii 
) , throughout the world, is a common last name. The surname Oleksii is characteristic of Kyrgyzstan, where it is quite a common surname, Moldova, and Belarus (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Russia, Kyrgyzstan, and Belarus. Much more prevalently, Oleksii is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Алексей | Kyrgyzstan, Russia, Belarus, Kazakhstan, Ukraine |
| Олексій | Poland, Russia, Ukraine, United States |
| Oleksii | Spain, Russia, Ukraine, United States, Poland |
| Олексий | Belarus, Russia, Ukraine |
Aleix, Alejo, Aleksei, Aleksej, Aleksejs, Aleksey, Alekseï, Aleksi, Aleksiej, Aleksij, Aleksy, Alekszej, Alekséi, Alessio, Alexei, Alexej, Alexey, Alexeï, Alexis, Alexius, Alexéi, Oleksa, Oleksi, Oleksij, Oleksiy, Olekszij, Olexa, Olexii, Olexij, Olexiy, Αλέξης, Алейс, Алексе'Й, Алексейс, Алекси, Алексий, Алексис, Алексы, Алексіс, Алесио, Алессио, Алехо, Алеш, Аляксей, Алёша, Алёшка, Лёха, Лёша, Олекса, Олексии, אלכסיי, אלכסיס, ألكسيس, أليكسي, اليكسي, ალექსი, アレクシ, アレクシス, アレクシー, and アレクセイ
Boiko, Sydorenko, Korniienko, Pavlenko, Petrenko, Marchenko, Savchenko, Avramenko, Kovalenko, Kuznetsov, Levchenko, Tamulianis, Tkachenko, Fedorenko, Ignatenko, Moskalenko, Shevchenko, Bondarenko, Kharchenko, Kravchenko, Polishchuk, Nesterenko, Shevchuk, Zaitsev, Oliinyk, Fedorov, Koval, Popov, Rybin, Maslov, Melnyk, Suslov, Babych, Bondar, Kozlov, Pavlov, Cherniavskyi, Petrov, Volkov, Ivanov, Morozov, Myklevych, Kovalov, Klochko, Klymenko, Rudenko, Tkachuk, Novikov, Leonov, and Ponomarenko