Last name Irsak (Irsak 
) , worldwide, is a rare cognomen. The family name Irsak is habitual in Slovakia, where it is a rare surname, Croatia, and Poland. Measured by absolute frequency, it is commonest in Poland, Indonesia, and India. Likewise, Irsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Irsak | Indonesia, Poland, United States, India, Slovakia |