Last name Pesliak (Pesliak 
, Песлиак 
) , all around the world, is a very rare cognomen. The family name Pesliak is characteristic of Lithuania, where it is a rare surname, Georgia, where it is a very rare surname, and Germany. In absolute terms, it is commonest in Lithuania, Russia, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Pesliak | Georgia, Lithuania, Germany, South Africa |
| Песлиак | Russia |