I hope you'll still get this message... I'm trying to do some research about Typpö name in Finland. I don't know much yet, but I'm really interested in to find out, if my husband's name Typpö, comes from the Alatyppö name.
Maybe you allready know, but David Sanfrid Typpö's brother, Leonard, was a quite famous songwriter,(spiritual), and a somekind of preacher. He was also a member of parlament in Finlad.
Typpö is also a quite rare name in Finland, so I think it makes things a bit easier to find out. BTW, are those Typpö people you know interested in building things, or otherwise technically oriented, because it seems, that those I've found in Finland are. And also musically.
My best wishes to you Jean, hope I hear from you some day.