are you even aware of who Rollo is?
1066 Battle of Hasting was with William the Conqueror.
that was when my ancestors Richard and John went to Britain, in 1066 at the Battle of Hastings.
Rollo's invasion and conquest of France, and giving the part that is now called Normandy (for holdinghisgroin) as a form of danegeld was quite a bit earlier.
on that note. that may be as far back as I can get as far as directly known ancestor.
farther back in time in the Old Norse Land, may have to just settle with knowing the Clan or area they are from. The names given to children during that time are usually to honor someone who recently died. The name may not even be from inside the clan or could be to honor the mother's great grand pappy from an entirely different clan.
the son or dottir was sometimes added to the first name of the father or mother and used for a last name. for example, John the son of Richard. giving the name of John Richardson. or Richard the son of John giving the name Richard Johnson. or in the case of a daughter, Susie the daughter of John giving the name Susie Johndottir. or could use the mother's name, Susan the daughter of Jan giving Susan Jandottir. meaning when speaking about Susan Jandottir, it is understood that to mean Jan's daughter Susan.
check out the Tree for William and Rollo.
http://en.wikipedia.org/wiki/William_I_of_England http://en.wikipedia.org/wiki/Rollobe sure to read the part under the title Legacy.
and this might be Rollo's father, no guarantees though.
http://en.wikipedia.org/wiki/Rognvald_Eysteinsson(ok spent enough time proof reading, fixing errors I've seen. if there are anymore errors of any kind, I don't care. figure it out yourself.)