Really? I thought Christina was somewhat popular in Sweden, like for instance here in Denmark, I know a lot of girls my age (17) with the name.
I don't really think popularity is that important when naming a future King/Queen though, Christian was not extremely popular in Denmark when our Prince was born, but obviously he was going to be named it because of traditions. But I don't know, what you say seems logical
Christina is a common name in Sweden but not as a 1:st name to new born girls. I also know some younger girls who has Christina as their 1:st name but to the younger generation it is more common as a 2:nd or 3:rd name from a statistical viewpoint.
We haven´t the tradition here in Sweden to name our first born prince either one name or an another like you have in Denmark. That´s a nice tradition i like. But Gustaf has become somewhat of a tradition in the "Bernadotte Dynasty". We have had four first born princes in a row with the name Gustaf. King Gustaf V, King Gustaf VI Adolf, Prince Gustaf Adolf and King Carl XVI Gustaf. The line was broken with Prince Carl Philip.
Ofcourse it is more important what the parents prefer than what is popular but for Victoria it is extremly important that it has a good historic connection and that the people like it. So i think we can expect a name that is not "totally out of date".
But time will tell