den 15 Oct blef hemmans åb(oen) Hans Bonassons hust(ru) Elna Olufsdott(er) förlöst med en son; den 19 ejusdem Xtnades han wid namn Swen.
I'm not quite sure about Bonasson, but have made a quick check that sons of a father with given name Bonde sometimes had Bonasson as their patronymic, so it is an existing name.