Svensk Damtidning speculated last week about the name and claims to know that Victoria had already when she was pregnant with Estelle promised to Carl Johan Bernadotte, that if the child would be a boy, it would be a Carl Johan. So if it will be a boy this time, a lot of speaks for that it will be called Carl Johan. Also Olof, which has connection to Daniel and Olle, and Oscar and Eugen could be choices.
If the baby is a girl, most likely Alice will be one of the names. Both Victoria's grandmothers had Alice in their names, and Alice Trolle-Wachtmeister has always been important person for Victoria. Royal names Josephine and Märtha could be there also. Swedish princess Märtha became the queen of Norway, and Victoria's friend Märtha Louise could be one of the godparents. Kristina could be also one of the names, according to SD, because it is one of the names of Ewa Westling and many strong women in the royal history have had it, like the queen's sister.
About the duchy, the baby will be a child of a queen. The king will give a big and important duchy to the baby. Much speaks about that it will be Öland, which means so much for the royal family. Besides, Öland hasn't had a duke since Karl X Gustav. The king could also choose a duchy which has never had a duke, like he did with Nicolas. Maybe it would be the beautiful Bohuslän. And Västerbotten is one hot tip, prince Gustaf Adolf and princess Sibylla were the duke and duchess of Västerbotten, and maybe the king wants to pay homage to them by giving the baby Västerbotten as a duchy.