# Clausen

Clausen is a Danish patronymic surname, literally meaning child of Claus, Claus being a German form of the Greek Νικόλαος, Nikolaos, (cf. Nicholas), used in Denmark at least since the 16th century. The spelling variant Klausen has identical pronunciation (as does the often interchangeable Claussen). The two variants are number 34 and 85 on the top 100 of surnames in Denmark. Occurrences of Clausen/Klausen as a surname outside Denmark and Schleswig-Holstein are due to immigration. Immigrants to English-speaking countries sometimes changed the spelling to Clauson.

## People

* Alden W. Clausen, (1923–2013), American businessman and former President of the World Bank
* Alf Clausen (born 1941), American film and television musical composer
* Andrea Clausen (born 1959), German stage actress (Burgtheater, Vienna)
* Arne Clausen (born 1932), Argentine Methodist Pastor
* Casey Clausen (born 1981), American football player
* Christopher John Clausen (born 1942), American writer
* Claus Clausen (1899–1989), German film actor
* Claus Kristian Randolph Clausen (1869–1958), US Navy officer in Spanish–American War.
* Claus Lauritz Clausen (1820–1892), pioneer Lutheran minister, military chaplain and politician.
* Connie Clausen (1923–1997), US actress, author
* Curtis Paul Clausen (1893–1976), American entomologist
* Donald Holst Clausen (1923–2015), US politician
* Frits Clausen (1893–1947), the leader of the Danish Nazi Party before the Second World War
* George Clausen (1852–1944), British painter
* Henrik Nicolai Clausen (1793–1877), Danish theologian and statesman
* Henry Christian Clausen (1905–1993), American lawyer
* Herluf Stenholt Clausen (1921–2002), Danish ichthyologist
* Hugh Clausen OBE (1888–1972), British naval armaments engineer
* Major General Hugh J. Clausen (1926–2009), Deputy Judge Advocate General of the United States Army
* Ian Clausen, American philosopher
* Jens Clausen (1891–1969), a Danish-American botanist and geneticist
* Jimmy Clausen (born 1987), US football player
* John Adam Clausen (1914–1996), American sociologist
* John Henry Clausen (1852–1930), farmer
* Jørgen Mads Clausen (born 1948), Danish industry magnate
* Kasper Klausen (born 1982), Danish footballer
* Kristoffer Clausen, Norwegian media personality
* Lars Clausen (1935–2010), German sociologist
* Luke Clausen, American fisherman
* Mads Clausen (1905–1966), Danish industrialist and father of Jørgen Mads Clausen
* Mads Clausen (footballer) (born 1984), Norwegian footballer
* Meredith Clausen (born 1942), American architectural historian and professor at University of Washington
* Néstor Clausen (born 1962), Argentine footballer
* Nicolai Clausen (1911–1943), German U-boat commander
* Peter Clausen (nineteenth century, dates unclear), also known as Pedro Cláudio Dinamarquez Clausen and as Peter Claussen, Danish natural history collector
* Pit Clausen (born 1962), German politician, mayor of city Bielefeld
* Raymond M. Clausen Jr. (1947–2004), United States Marine Corps, Medal of Honor recipient, Vietnam War 31 Jan 1970.
* René Clausen (born 1953), American composer
* Rick Clausen (born 1982), American football player
* Roy Elwood Clausen (1891–1956), American botanist and geneticist
* Sally Clausen (born 1945), American educational administrator
* Thomas Clausen (mathematician) (1801–1885), Danish mathematician and astronomer
* Thomas Clausen (musician) (born 1949), Danish jazz pianist
* Thomas Clausen (Louisiana) (1939–2002), American education superintendent, brother of Sally Clausen
* Sven Clausen (Danish author, playwright, doctor of law) (1893–1961)

## Places

* Clausen, Luxembourg, a quarter in Luxembourg City
* Clausen, Germany, a town in Rhineland-Palatinate and site of a former US Army chemical weapons facility

## Other

* Clausen function, a mathematical function