The Norwegian equivalent to Otso would be the name Bjørn. I don't see why it shouldn't work in Finland, when being named "bear" works in Norway.
― Anonymous User 8/28/2017
2
Otso was a euphemism for "karhu" (the most common name for a bear nowadays), used alongside words like mesikämmen, kontio and nalle. It was feared that the animal would be summoned if its proper name was used.
This name has become very popular for some strange reason, and I can only imagine how weird it's going to be when all these little boys named Otso are actually adults. It sounds cute on little boys, I guess, but not on men.