Technically, the daughter of Frostí, which is a recognised masculine name in Iceland. And also her father’s name: they don’t use family names in Iceland (other than about 7 surnames grandfathered from the Danish colonial era, but those are uncommon), and people have one or two given names and a patronym, a system which has so far scaled well enough for Iceland.
Sweden only made the change gradually about a century ago, with it happening first in urban areas. The merchant Clas Ohlson, after whom the dry goods chain is named, was the son of Olle something-other-than-Ohlson, and the first in his line to make their surname a family name.
Surnames that describe the individual (“son of Olaf”, “the blacksmith”, “from up the river”) work fine in small-scale societies, but are a problem for bureaucracies and other systems. IIRC, a lot of the pressure for standardised family names in Europe was to make things like taxation and conscription more manageable.