23 mentions are found for request
different sources from the year —1938 (9) 1942 (2) 2007 (12)

Tihomir Ištvanović

Source: 'Encyclopaedia of Croatian Surnames , year 2007.

Ivan Ištvanović

Source: 'Encyclopaedia of Croatian Surnames , year 2007.

Antun Ištvanović

Source: 'Encyclopaedia of Croatian Surnames , year 2007.