Kosonen

Kosonen is a Finnish surname. It is derived from koski, meaning "rapids," with the diminutive suffix -nen, a common element in Finnish surname formation. The combination typically indicates origin from a place characterized by rapids or a family living near such a landscape, making Kosonen a toponymic surname tied to the Finnish environment.

The name is most commonly found in Finland and is borne by a number of families across the country. It is also found among people of Finnish descent in Sweden and in other countries to which Finns have historically migrated, including North America. As with many Finnish surnames, Kosonen is used by individuals of all genders, and there is no distinct feminine form in modern usage.

Related surnames share the same root koski and include Koski, Koskinen, and Koskela, among others. These names reflect a family or locality connected to rapids or fast-moving water. The Kosonen surname has appeared in various domains such as education, culture, sports, and public life, contributing to its recognizability within Finnish society.