In all the world, Геыдт (Геыдт , Geydt ) is an extremely rare unknown gender first name. Much more frequently, Геыдт is the last name as well as the forename.
Heydt
Сергей
, Geydt 
) is an extremely rare unknown gender first name. Much more frequently, Геыдт is the last name as well as the forename.