The name Grua comes from a farm name in Norway. The little town of Grua is located about 45 minutes north of Oslo. Tron Eriksen Grua emigrated to America in 1869. In June of 2008 I have learned that his sister, Ingeborg, also emigrated to America in 1871. In America Tron met and married Mari Ostensdatter Overmoe who was from the Overmoe farm in the Kvam parish in the Nord Fron area of Gulbransdalen, Norway. In America Ingeborg met and married Lars Johnsen Haga. Lars and Tron came to America together. Since the Norwegians were using the patronymic naming system, the surname changed every generation. It is thus hard to list here a list of surnames included on this link. The pedigree charts are helpful for this.