Fredrik Johnson, Eva Johnson Eckstrom (don't know Swedish version of Johnson)

[Stephanie Johnson]

Fredrik Johnson (do not know Swedish version), born around 1848 in Värmland.  He probably emmigrated to Elm Dale or Upsala, Morrison Co, Minnesota, USA around 1887.  He lived in Elm Dale by 1895.  He was my great grandfather.
 
Circumstantial evidence points to the fact that Eva Johnson Eckstrom was his sister.  She was born 29 Sept 1855 in Värmland.  Eva immigrated to Elm Dale, Morrison Co., Minnesota, USA in 1889.  She married John P. Eckstrom in 1890.
 
Victor may be a family name.  Fredrik 2nd son, my grandfather was Victor (spelled Wiktor on his baptimal certificate), and Eva and John Eckstrom had a son named Victor.
 
I do not have a parish name, and I do not know the Swedish version of the last name.  As you can see, I have very little information on Fredrik.  Any help to further my search would be greatly appreciated.

[Stephanie Johnson]

Fredrik Johnson probably first immigrated to Minneapolis, Hennepin County, Minnesota.  He married Sophia Peterson March 30, 1888 in Hennepin County.
 
More evidence that Eva Johnson Eckstrom was he sister... she raised Fredrik and Sophia's infant son, David.  On a 1900 census, David is listed as nephew.  The same census listed Eva as being born September, 1854... so her birth date could be September 29, 1854.
 
Any help would be greatly appreciated.