13 mentions are found for request
different sources from the year —1926 (7) 2007 (6)

Irena Ištvanić

Source: 'Encyclopaedia of Croatian Surnames , year 2007.

Tomislav Ištvanić

Source: 'Encyclopaedia of Croatian Surnames , year 2007.

Drago Ištvanić

Source: 'Encyclopaedia of Croatian Surnames , year 2007.