The head of the house hold was Torkel Sorenson, he and his wife Gunvar came from Norway about 1855. The records on Robert come from a small church in Elk Mound Wisconsin, all the people attending that church were from Norway. Torkel was the son of Soren, Torkel's children had broken tradition by using the name of Sorenson instead of Torkelson because they were in the United States, If they had remained in Norway they would have gone along with old traditions. I may be wrong but I believe Torkild is a female name only. Thus Robert was the son of a woman name Torkild. (Torkildson) If he had been a daughter instead then I could see Torkildsdatter in old tradition.
One of my great great great aunts who is buried in Mondovi Wisconsin has this written on her grave(Brita Nielsdatter Fjerstad Hove). It means she was the daughter of Niels, she was born on the Fjerstad farm in vik Norway and she was married to a man by the last name of Hove. My great great grandfather Ivar Nelson(Brita's brother) only used that name here in the United States. His real name would have been Ivar Nielson Fjerstad.