found: Work cat.: Long, W.G. History of the Grim family ... 1934.
found: Fertich, J.L. A history and genealogy of the Fertig, Fertich, Ferdig family of Pennsylvania, 2004:index (Ferdig, Fertich, Fertig, Förtig)
found: Am. fam. names(Fertig) ; (Ferdig is a variant of the German surname Fertig)
found: Branterud, 2015:title page (the Färdig family history) page 48 (Olof Gustafsson Färdig [Ferdig]; emigrated from Sweden to America) page 60 (Olof signed his name on official papers as Olor Gustafson Ferdig, probably spelling his name the way it was pronounced in Canada and the US. His twin Anders [Andrew] continued to use the surname Färdig in the US) (DLC)2017301108
notfound: Cent. pop. growth