Probably it's because the time is right.
Sixten has passed the first stadium, "names your parents have", the second stadium, "name your grandparents have" and reached the third stadium, "names that were popular about 100 years ago and are fresh to rediscover".
I love
Sixten because it's my cat's name! (Although we spell it Zixten.)
Does the sea exist
Because of our longing?
My PNL
http://www.behindthename.com/pnl/3258/61573