In all the world, Istvanne (Istvanne 
, Истванне 
) is a rare female forename. The given name Istvanne is characteristic of Hungary, where it is quite a rare female name, Slovakia, where it is a rare feminine name, and the United Kingdom, where it is a very rare mostly female, but seldom male name. Much less frequently, Istvanne is the last name as well as the forename.