About the Olsen surname
The surname Olsen is associated with a patronymic formation. The surname ending is typical of a Scandinavian patronymic formation generally meaning “son of.”. The name therefore belongs to a tradition in which an ancestor's given name gradually became a hereditary surname. Different families could independently adopt a surname formed from the same given name.
Pronunciation:
Ol-sèn/ɔlsɛn/