Fun fact that you probably know already. Omar Rudberg (playing Simon) is a quite famous singer/dancer in Sweden who was in a very popular boy-band called FO&O some years earlier. The director told them they would have to name the fish just before they filmed this scene. Edvin (Prince Wilhelm) suggested Omar name the fish after his band mates. Omar altered the names just a bit so as not to make his ex-bandmates mad at him.