Roraus or Røraas

Ok now I have some names I found in my paperwork from a relative the names of the brothers that came to america was thorvald judagneas Roraus and albert andreas andersen roraus but they used Roraas. the orginal family name was andersen the second family was given the names roraus which was the name of the farm where they lived in Karmony, norway I hope thats the way you spell it. Well I hope that their someone out their that can help.