Family name Janusik (Janusik 
, Янусик 
) , all over the world, is a rare cognomen. The last name Janusik is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Slovakia, where it is a rare surname, and Poland. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Poland, Belarus, and Russia. Also, Janusik is the forename as well as the last name.