Family name Алексеий (Aleksey 
, Алексеий 
, Alexeii 
) , in the entire world, is a rare cognomen. The cognomen Алексеий is characteristic of Belarus, where it is a rare surname, Uzbekistan, and Russia. Measured by absolute frequency, it is the most numerous in Russia, Uzbekistan, and the United States. Much more frequently, Алексеий is the forename as well as the last name.