I have a large database of Ranfts of which most are/were resident in Germany (Leipzig and surrounds).
Michael George Walter Ranft b.5 MAY 1854 moved to the UK (London). Recently I had contact with David Debenham Ranft who is the Grandson of Michael George.
Otto Richard Ranft b. 1825 moved to the US (Bay Shore, NY). He had at least one son, Richard Ranft who in turn had at least one daughter who married a Baumgartner. Unfortunatly I have not been able to establish contact with any of his descendants.
Also the book that lists all these Ranfts was published in 1962 and therefore about 2 generations are "missing".