New Sellmer/Selmer info
From the Baptismal Register of GrossFlintbek (northern Germany, near Kiel):
Born Oct 1st 1785, baptised Oct 2nd 1785: Jurgen Hinrich Sellmer, son of Cartmaker (Rademacher) Hans Selmer and wife Catharina Dorothea (nee Repensch).
Jurgen Repensch, Rumohr
Johann Hinrich Stahlmann, Rumohr
Margaretha Christina Gnutzmannsch, Rumohr
As you can see, the Selmer changed to Sellmer.