Title: Andersen
Content:  Andersen is a Danish-Norwegian patronymic surname meaning "son of Anders" (itself derived from the Greek name "Ανδρέας/Andreas", cf. English Andrew). It is the fifth most common surname in Denmark, shared by about 3.2% of the population. From the same root – the given name Andreas – derives the surname Andreasen (cognate Andreassen) and Andresen. The numbers of bearers of the surnames Andersen, Andreasen, Andreassen and Andresen in Denmark and Norway (2009):
Title: Andresen
Content: Alexandra Andresen (born 1996), Norwegian heiress, world's youngest billionaire ; August H. Andresen (1890-1958), American politician ; Björn Andrésen (born 1955), Swedish actor ; Frode Andresen (born 1973), Norwegian biathlete ; Martin Andresen (born 1977), Norwegian footballer ; Momme Andresen (1857–1951), German industrial chemist who invented the photographic developer "Rodinal" ; Ryan Andresen, gay American Boy Scout ; Sophia de Mello Breyner Andresen (1919-2004), Portuguese poet Andresen v. Maryland, U.S. law case Andresen and the parallel form Andreasen (Norwegian cognate Andreassen) are Danish-Norwegian patronymic surnames meaning "son of Andreas". It has a similar origin as the name Andersen. It may refer to:  Also:
Title: Anders
Content:  Anders is a male name in Scandinavian languages and Fering North Frisian, an equivalent of the Greek Andreas ("manly") and the English Andrew. It originated from Andres via metathesis. In Sweden, Anders has been one of the most common names for many centuries, earliest attested in 1378. It was common for priests and farmers during medieval times. According to Statistics Sweden, as of December 31, 2002, it ranks 4th among the male names. The great frequency of this name at the point in time (around 1900) when patronymics were converted into family names is the reason why 1 out of every 30 Swedes today is called Andersson. The name day of Anders in the Scandinavian calendar is November 30, and in the old peasant superstition that day was important for determining what the Christmas weather would be. If it was very cold on November 30, there would be much sleet on Christmas (and vice versa). In Denmark (but not in Norway or Sweden), Donald Duck's name is Anders And. The Fering name Anders may have been borrowed from the Danish version.
Title: Andreasen
Content: Christian Andreasen (born 1988), Danish footballer ; Emil Andreasen (1895–1972), Danish boxer ; Frank Andreasen, Danish darts player ; George Andreasen (1934-1989), American orthodontist ; Heidi Andreasen (born 1985), Faroese paralympic swimming silver medalist ; Jakob Andreasen, Danish handball coach ; Lawrence Andreasen (1945-1990), American athlete ; Leon Andreasen (born 1983), Danish footballer ; Marta Andreasen (born 1954), Argentina-born member of the European Parliament ; Nancy Coover Andreasen (born 1938), American neuroscientist ; Rannvá Andreasen (born 1980), Faroese association footballer ; Søren Andreasen (born 1996), Danish footballer Andreasen and the parallel form Andresen (Norwegian cognate Andreassen) are Danish-Norwegian patronymic surnames meaning "son of Andreas". It has a similar origin as the name Andersen. It may refer to: 
Title: Anderson (surname)
Content:  e.g. the German vocalist Lale Andersen (1905-1972). The Scandinavian forms Andersson and Andersen were often rendered as Anderson by immigrants to the English-speaking countries, whereby the latter form became one of the most common surnames in Anglophone North America. The name was the eleventh most common surname reported in the 1990 United States census, accounting for 0.3% of the population. It was the twelfth most common surname reported in the 2000 United States Census. Anderson is also one of the most popular surnames in Canada. Other spelling variations include: Andison, Andersonne, Andersoun, Andirsoone, Andresoun, Androson, Andirston, Andresson, Andrewson, and Andresen.
Title: Rasmus Andresen
Content:  Andresen mainly grew up in Flensburg and belongs to the Danish minority of Southern Schleswig. He graduated from Duborg-Skolen in Flensburg and later with a bachelor degree from Roskilde University in Denmark.
Title: Anderson (surname)
Content:  of Scotland from the Mearns through Aberdeenshire, Banff, and Moray. In England, the very first recorded spelling of the family name is probably that of William Andreu, which was dated 1237, in the ancient charters of the county of Buckinghamshire, England, in the year 1237. Anderson is the eighth most frequent surname in Scotland and 52nd most common in England. In Sweden, the form Andersson is the most common surname. In Norway and Denmark, the form Andersen is quite common, being the fifth most common surname in both countries –see Andersen. It's also found to a lesser extent in northern 
Title: Andreas
Content:  Andreas (Ἀνδρέας) is a name usually given to males in Austria, Greece, Cyprus, Denmark, Armenia, Estonia, Ethiopia, Eritrea, Finland, Flanders, Germany, Norway, Sweden, Switzerland, Romania, the Netherlands, and Indonesia. The name derives from the Greek noun ἀνήρ anēr, with genitive ἀνδρός andros, which means "man". See the article on Andrew for more information. The Scandinavian name is earliest attested as antreos in a runestone from the 12th century. The name Andrea may be used as a feminine form, but is instead the main masculine form in Italy and the canton of Ticino in Switzerland.
Title: Anderiesen
Content: Henk Anderiesen (1898–1980), Dutch footballer ; Wim Anderiesen Sr. (1903–1944), Dutch footballer ; Wim Anderiesen Jr. (1931–2017), Dutch footballer Anderiesen is a Dutch patronymic surname (son of Andries). Notable people with the surname include: 
Title: Andres (name)
Content:  Andres or Andrés is a male given name. It can also be a surname. It is derived from the name Andreas.

Question: where does the last name andersen originate from?
Answer: Danish.
Norwegian.