Claesson

Claesson is a Swedish surname. It is a patronymic derived from the given name Claes, a form of Clas or Nicholas, with the suffix -son meaning “son of.” The name therefore originally identified a person as the son of Claes.

The name is most common in Sweden and is also found among Swedish-speaking populations in Finland and in diaspora communities abroad. Like other patronymic surnames, its spread reflects the historical shift toward hereditary family names in Sweden.

Notable bearers include Mårten Claesson, a Swedish architect who co-founded the architectural firm Claesson Koivisto Rune. The firm is internationally recognized for its minimalist, human-centered design and has completed projects across Europe and beyond.

This surname is primarily associated with Sweden, and while it is not tied to a single profession, it is most commonly encountered among Swedes and people of Swedish descent. See also Claesson Koivisto Rune.