I'm wondering if they'll use
Frederik. It seems customary for the first sons of future monarchs to receive the names of any royal grandfathers, uncles and a famous ancestor, so they might wait and use
Frederik on any future male children.
I'll be very surprised if
Mary and
Frederik don't use
Christian. I was shocked when
Haakon and Mette-Marit didn't use
Olav, which a lot of people thought the couple was sure to use. Even if they hadn't used
Olav, I thought for sure they'd use another family name. No matter, though, because I love
Sverre. It's a perfect match for
Ingrid. :)
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