The children of Prince Constantijn have a surname according
article 1 of the Royal Decree of May 11th 2001: "The
surname of the children whom might be born in the marriage of His Royal Highness Prince Constantijn Christof Frederik Aschwin of the Netherlands, Prince of Orange-Nassau, Jonkheer van Amsberg with Ms Petra Laurentien Brinkhorst reads:
Van Oranje-Nassau van Amsberg, with the title of Count and the predicate Jonkheer."
The children of Prince Constantijn are:
The highborn lady Eloïse Sophie Beatrix Laurence Countess
van Oranje-Nassau van Amsberg
The highborn lord Claus-Casimir Bernhard Marius Max Count
van Oranje-Nassau van Amsberg
The highborn lady Leonore Marie Irene Enrica Countess
van Oranje-Nassau van Amsberg
The children of Prince Friso have a surname according
article 1 of the Royal Decree of March 19th 2004: "To let His Royal Highness Prince Johan Friso Christiaan Bernhard David of the Netherlands, Prince of Orange-Nassau, Jonkheer van Amsberg behold the title Prince of Orange-Nassau as a personal title, with the predicate of Royal Highness, to grant him the hereditary title of Count and to establish his
surname as
Van Oranje-Nassau van Amsberg."
The children of Prince Friso are:
The highborn lady Emma Luana Ninette Sophie Countess
van Oranje-Nassau van Amsberg
The highborn lady Joanna Zaria Nicoline Milou Countess
van Oranje-Nassau van Amsberg
With these two Royal Decrees as new noble family has been established:
Van Oranje-Nassau van Amsberg. As there were only two males with that surname (the late Prince Friso and his nephew Count Claus-Casimir), the continuation of this young dynasty lies in the hands of one person, see picture:
http://www2.pictures.zimbio.com/gi/Count+Orange+Claus+Casimir+Princess+Carolina+JAojErBxkxdx.jpg