Óttarssonar
Óttarssonar is a patronymic, meaning it indicates "son of Óttarr." In Old Norse and Icelandic naming conventions, this suffix denoted the father's name. Therefore, Óttarssonar would have been used to identify a male individual whose father's given name was Óttarr. This practice was common throughout Norse and Scandinavian societies, serving as a primary method of personal identification alongside the given name. The specific form "Óttarssonar" suggests a genitive case, often appearing in contexts where possession or lineage is being emphasized, or it could represent a slightly older or dialectal variation of the more common "Óttarsson." Without further context, it is difficult to pinpoint a specific historical individual bearing this exact patronymic, as it was a widespread naming pattern. However, many historical figures would have carried names derived from "Óttarr," and their sons would have been identified as Óttarsson. This naming tradition persisted for centuries before modern surname systems became widespread.