>>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).

A Dutch (international) soccerplayer's surname is 'Vennegoor of Hesselink'. The word 'of' would be 'or' in English. As a matter of fact, he is currently playing in Scotland and there they now think he has royalty in him. (http://sport.scotsman.com/football.cfm?id=1262682006)

He explained his name: "About 300 years ago, all the farms in eastern Holland had specific family names but when two of them intermarried, they carried equal social weight and were combined."

The Dutch soccer commentators continue to call him 'Jan Vennegoor of Hesselink' each time he receives the ball. And each time we, the public, think "who received the ball?". Why can't they simply call him Jan Vennegoor?! It is common usage (allowed) here to call people with double names by the first one only.