(hint: all end in -sen)
Well, 2-3, but 5? It's useless.
Generally meaning son as in the male child. So e.g. Eriksen = Son of Erik, Svensson = Son of Sven.
Also, as someone who grew up in Minnesota, I feel deep shame at only getting 2 of the 5 family names.
Edit:Of dutch decent I just found out (I believe further down the line german though, but gonna quit now, got lost for hours on genealogy sites and old recordings of baptisms haha. Interesting though, but I shouldnt forget to get up and eat)
Also Hammerfest has fewer than 10,000 inhabitants, so maybe the question should be >5,000. I tried Alta and Tromso a few times, but then gave up.