Koskinen is a surname of Virtanen type originating in Finland (in Finnish, koski means "rapids"), where it is the ninth most common surname. Notable people with the surname include: Aarno Yrjö-Koskinen (1885–1951), Finnish politician, ambassador and freiherr. Harri Koskinen (born 1970), Finnish designer. Heikki Koskinen (born 1930), Finnish chess master. Jari Koskinen (born 1960), Finnish politician, Minister for Agriculture and Forestry of Finland. Johannes Koskinen (born 1954), Finnish politician (M.P., Minister of Justice) John Koskinen (born 1939), American former U.S.
https://en.wikipedia.org/wiki/Koskinen