nice wallpaper!!!
i doubt about IA's regal name as a Queen, Catharina-Amalia has a - bonding the two names, but IA doesnt have - between Ingrid and Alexandra. i believe when her father succeeds the throne she'll be Crown Princess Ingrid of Norway, just like her father when he became the first line in the throne, his second name Magnus wasnt used in his official title, thus becoming Crown Prince Haakon and not Crown Prince Haakon Magnus.
i think its a tradition in the Norwegien royal family to have just two names, but when becoming the heir and eventually a monarch, just the main name is used instead.