My grandmother was a daughter of Henry Miller. I have done a great deal of research on the family. From what my grandmother told me, Matti changed his family name to Miller after coming to America. Matti and Heleka's first daughter (Christina) was born on the trip to America. The rest of the childern were born in America. If you are still looking for information let me know and I can send what I have found.
I am trying to find information on Henry's first wife Lempi. I all the different records available her last name seems to change: Marjeta, Marita, Soini.