I was just speaking out of a gut feeling, but after I looked into it - it seems that I was wrong about their popularity.
The most popular dog breeds in Finland are:
1. Finnish Hound
2. German Sheppard
3. Labrador Retriever
4. Golden Retriever
5. Finnish Lapphund
6. Norwegian Elkhund
...
12. Finnish Spitz
So it seems that all the Finnish breed are very popular in Finland, go figure?
Finnish Hound
Norwegian Elkhund
Finnish Spitz
I just haven't seen many of those Finnish breeds in day-to-day life, but I guess they are more popular in the rural parts of Finland (Eastern Finland and Lapland) where people do more hunting.