13 mentions are found for request
different sources from the year —1942 (7) 2007 (6)

Ivan Šivak

Source: 'Encyclopaedia of Croatian Surnames , year 2007.

Franjo Šivak

Source: 'Encyclopaedia of Croatian Surnames , year 2007.

Vladimir Šivak

Source: 'Encyclopaedia of Croatian Surnames , year 2007.