In a State Council half an hour ago the King of Sweden announced that the name of the newborn princess will be Estelle Silvia Ewa Mary and that she will be Duchess of Ostrogothia.
While speculations had centred on the names of earlier Swedish queens, no-one had foreseen that the choice would be a non-royal French or American name. The only royal connection of the name Estelle is the American Estelle Manville (1904-1984), who in 1928 married Count Folke Bernadotte af Wisborg, the youngest son of Prince Oscar Bernadotte and thus grandson of King Oscar II of Sweden and of Norway.
Silvia is obviously after her maternal grandmother the Queen of Sweden and Ewa for her paternal grandmother Ewa Westling, while Mary may perhaps indicate that the Crown Princess of Denmark will be among her godparents.
The dukedom of Ostrogothia (Östergötland in Sweden) has been used three times since dukedoms were (re)introduced by Gustaf III in 1772. That year he gave it to his youngest brother, Prince Fredrik Adolf, and it was subsequently given to the future King Oscar II when he was born in 1829. The last holder was Prince Carl Jr, the only son of Prince Carl (and thus grandson of Oscar II), who received the dukedom of Ostrogothia when he was born in 1911, but lost it when he married a commoner in 1937. It is worth noting that the new Duchess of Ostrogothia is the daughter of the Duchess of Westrogothia (Crown Princess Victoria) just like Prince Carl Jr was the son of the previous Duke of Westrogothia.