The Schwerdtfegers of my ancestors have been in Hannover since 1668 (at least notified so). Then part of them went in 1740 to Schleswig-Holstein (Northern region of Germany). My Ancestor Jost Hinrich Schwerdtfeger ist the first one, who went there. As far as I know, all those were written Schwerdtfeger (with D). Maybe is has been originally Schwertfeger, as the german word for SWORD ist Schwert. Please excuse my poor English!!