Those are Scandinavian names (as listed), not Finnish ones, and so may only apply to a very limited extent to Islander characters. Note that the Finnish cultural roots have very little in common with the Scandinavian ones, with Scandinavia being dominated by Indo-European migration, while Finland was (re)populated by Uralic peoples using Finnish-Ugric languages.
A problem with many of the names UrW gives to people is that they look, on the surface, as they're local variations of Christian names, which shouldn't have reached Finland at that time. Note that I'm neither Finnish nor knowledgeable about Finnish, so there may well have been preexisting local names that happen to look similar to Christian ones.