In the entire world, Mariyenko (Мариенко , Mariyenko ) is an extremely rare unknown gender forename. Much more frequently, Mariyenko is the last name as well as the forename.
Маріенко, and Марієнко
Oleg
, Mariyenko 
) is an extremely rare unknown gender forename. Much more frequently, Mariyenko is the last name as well as the forename.