Segerborg in Vadstena-help needed

[Sue Fritz]

My great-grandfather, Charles Oscar Seeber (born 1875), came alone to the US in either 1884 or 1886 to live with relatives in Hobart, IN.  He told family that his parents were August Gustave and Matilda Segerborg from Vadstena.  He said that his family all remained in Sweden and that he had twin siblings.  My great-grandmother corresponded with Charles' mother in Sweden after 1900.
I am not sure of either the name Segerborg nor the spelling.  I would appreciate any help or suggestions in finding this family.