>>>the familiy name or
>>>the own name before wedding or
>>>a combination of both familiy name-own name or vice versa. Except the name of both before wedding was identicaly.
>>
>>I know of a case when both of them had the same last name before marying, and that the clerk had to go through motions asking them which combination they wanted: to keep their old surnames (Petrović and Petrović), to take the surname of the other (Petrović) or to append (become Petrović-Petrović).
>
>And which did they go for?

I think they exchanged surnames, or at least that was their insider joke.