Query: The Bjorneby family on the Incognito 1851?

I am searching for pre-1851 information about a Bjorneby family in Norway. Ref: Passenger List for the Incognito, which sailed from Christiana on 27 Jun 1851 /emigration/passengers/?journey=886 What appears to be a family is transcribed as #8-14 on the list: Engebreckt Christenson 53 m Ragnild Christenson 45 f Christen Engebrecktson* 22 m Karin Engebrecktsdatter* 19 f Gumari Engebrecktsdatter* 17 f Guro Engebrecktsdatter* 14 f Barbra Engebrecktsdatter* 25 f Family records here in the USA say that this family came from Asnes, Solor, Norway, and that when they got to the USA they started using "Bjorneby" as a surname. I believe they joined the Roche-a-Cree Norwegian settlement in Strongs Prairie Twp, Adams Co., Wisconsin, in 1853, after living for a couple of years in Dane Co., Wisconsin. The genealogy I am assembling lists the 1851 emigrant family as follows: Engebregt Bjorneby b. 1799 Ragnhild Bjorneby b. 1802 Christian age 22 Karen age 19 Gunnerius age 17 Gord age 14 (We have no record of a Barbra, 25 years old in 1851) I have a 1851 Bible that belonged to "Embret Christiansen Bjornebyquarn," as he himself wrote his name. Records from the Roche-a-Cree Congregation of the Norwegian Lutheran Church, now in Arkdale, Wisconsin, list these names: Gunnerius Ingebrigtsen Karen Ingebrigtsd. / Karen Ingebretsdr. / Karen Ingebretsen / Karen Kristiansen (all the same person) and listed are several children of Karen and her husband Christoffer Anderson, who emigrated from Hedal, Valdres, Oppland. Now then -- here are my questions 1. Why did my great-great grandfather write his last name as "Bjornebyquarn"? 2. Is there a record in the 1801 Norwegian census for "Engebreckt Christenson," in Asnes -- he would have been 2 or 3 years old in 1801.. 3. Are there any records of a Bjorneby farm in Asnes? 4. Are there records of the marriage of Engebregt Christianson and Ragnhild Guttormsdatter in Asnes in about 1828? Records of the births/christenings of their children? 5. Is Karen's husband in the USA, Christoffer Andersson, the same Christoffer Andersson, listed as #15 on the 1851 Incognito passenger list? 6. Did a Christoffer Andersson, son of Anders Poulson, emigrate from Hedal, Valdres, in 1851, and sail on the Incognito? I apologize for asking so many questions, but I can't get to Norway to do this digging myself. I will be very grateful is something turns up! Thanks for your help.