My links to Finland/Estonia are lost in the distant past! But everyone with my Surname (and variants) are also from the same ancestry. This is contrary to thousands of unimaginative pseudo-genealogy sites and businesses across the internet and before then. I am Jarvis-2158 born in England. I grew up with the story that we were 'Vikings' yet all 'authorities' stop at the 'aristocratic' Gervaise family who arrived with William, Duke of Normandy. and they assign Jarvis as an anglicisation of that name. Yet William, and the French 'Nor(th)mans' were very recently descended from the Viking brother who sided with the French king to defend against his own invading Viking brother. I have always followed clues from events, news and maps. Now It is clear that all 'Jarvis' people (and Gervaise descendants of us!) are descended from people who built their homes on man-made island/platform constructions 'in the lakes' of Finland and Estonia (järvessä and järves respectively). Not 'on', 'by', 'of' or just 'lake' but specifically 'in' the lake. These type of dwellings have been extensively studied in NE England, East Anglia Fens and the Cheshire Meres. Exactly where most Viking settlement occurred in early Britain... no doubt in Ireland too. I wonder how Gaelic modified the Jarvis surname?
There is also a misconception that the suffix 'son' in Scandinavean patronyms always means just what it says in the modern English.. 'son of', yet in most other Baltic tongues 'soen' (spellings and diacresis?) also means 'lake', whereas 'son' or 'boy' in Finnish/Estonian is 'poika', and in some other Baltic tongues is 'pojka' (Swedish) which survives in Groens (N Holland) and in Afrikaans slang as 'bojkie' -(b-oi-ki) meaning 'young boy' and 'son'. Yet in Swedish 'lake' is 'sjön' and not 'jarvi', so for them 'in the lake' is 'i sjön'. So the 'patronym'so- called, of Amundson can be deconstructed to 'a mund i sjön' meaning 'a mouth in the lake' or 'ad mund i sjön' meaning 'by mouth in the lake' and '... a sjön' 'along the lake', and so on!
The point? There are a lot more people out there with Finnish/Estonian descent than they themselves realise... perhaps you should tell them about themselves! You may find many more collaborators for this great project! The Jawitz's might be especially interested in their ancestors' 'day job'.... as warriors of Thor! :-))