Worldwide, Ljapunov (Ляпунов , Ljapunov ) is an extremely rare unknown gender first name. Much more frequently, Ljapunov is the last name as well as the forename.
Liapunov, and Lyapunov
Mr
, Ljapunov 
) is an extremely rare unknown gender first name. Much more frequently, Ljapunov is the last name as well as the forename.