Lassen

Lassen is a patronymic surname and, less commonly, a given name, originating from the Low German and Danish regions. It literally means 'son of Lars'. Lars is a Scandinavian form of Laurence, which itself derives from the Roman cognomen Laurentius, meaning 'from Laurentum' (an ancient city in Italy). The surname became established as families adopted fixed surnames, often based on the father's given name.

Over time, some surnames, including Lassen, have been occasionally adopted as first names, particularly in cultures where surname-as-first-name traditions exist. Its usage as a given name is relatively rare compared to its prevalence as a surname.