Last name Сергею (Сергею , Sergeyu ) , across the world, is an extremely rare family name. Much more prevalently, Сергею is the forename as well as the last name.
Sergeju
Щаулин, Рябову, Зюзикову, Артюшин, Заузину, Парницыну, Шабалкину, Беженару, Горелову, Немчинову, Савинову, Кузьменко, Соловьеву, Харламову, and Генералову
, Sergeyu 
) , across the world, is an extremely rare family name. Much more prevalently, Сергею is the forename as well as the last name.