Fredrik is derived from the Germanic name Friedrich or Friederich, from the Old High German fridu meaning "peace" and rîhhi meaning "ruler" or "power". The name means "peaceful ruler" The most common variant spelling of this name is Frederik, although the English spelling Frederick is more common than either. Fredrik replaced the Anglo-Saxon name Freodheric, and has been a rare first name in England since this time.

In Sweden, Fredrik first fell into usage in the 14th century, and became increasingly common after the 18th century. It is the 19th most popular male name in Sweden and the 41st most popular in Norway. It has a name day in Sweden, on July 18. Common diminutive forms include: Fred,Frillo, Fredde, Freddy and Rikke. The form Freddie is considered feminine by the British, diminutive of for instance Fredrika.

Fredrik Thordendal (born February 11, 1970) is a Swedish lead-guitarist of the metal band Meshuggah.

He, along with Meshuggah's rhythm guitarist Mårten Hagström were rated #35 by Guitar World in the top 100 greatest heavy metal guitarists of all-time.

Thordendal began his career when he formed "Metallien", a heavily Metallica-influenced band, in his hometown Umeå in 1985. The band later changed their name to Meshuggah and released their first LP Psykisk Testbild in 1989. Beginning as a thrash metal band, Meshuggah's music gradually evolved into a more progressive sound. The band is now known for having created Djent, a sub-genre of Progressive Metal. Thordendal has been widely recognized in the metal community for his work with Meshuggah.

Under the name Fredrik Thordendal's Special Defects, Thordendal released a solo album in 1997 titled Sol Niger Within with Ultimate Audio Entertainment. The album was remixed and re-released by Ultimate Audio Entertainment and Relapse Records in 1999 under the title Sol Niger Within version 3.33. The re-release contains two bonus tracks but omits several parts of the original version. Thordendal also featured on several tracks for drummer Morgan Ågren's Mats/Morgan Band.

John Fredrik Reinfeldt (pronounced [ˈfreːdrɪk ˈrajnˌfɛlt] ( listen); born 4 August 1965) is the Prime Minister of Sweden, leader of the liberal conservative Moderate Party and former President of the European Council.

A native of Stockholm County, Reinfeldt joined the Moderate Youth League in 1983, and by 1992 had risen to the rank of chairman, a position he held until 1995. He has been a Member of Parliament since 1991, representing his home constituency. Following the 1994 defeat of the Moderate-led coalition government, Reinfeldt adopted a critical stance against the party leadership under Carl Bildt, which resulted in isolation within the party. However, following a change of leadership in 1999 and a bad result in the 2002 election, Reinfeldt gradually gained influence within the Moderate Party.

Reinfeldt was elected party leader on 25 October 2003, succeeding Bo Lundgren. Under his leadership, the Moderate Party has transformed its policies and oriented towards the centre, branding itself "the New Moderates" (Swedish: Nya moderaterna). Following the general elections held on 17 September 2006, Reinfeldt was elected Prime Minister by the new parliament on 5 October and presented his cabinet the following day. Together with the three other political parties in the centre-right Alliance for Sweden, Reinfeldt presides over a coalition government with the support of a narrow majority in the parliament. At the age of 41, he was the third youngest person to become Prime Minister of Sweden. After the 2010 election Reinfeldt's government was reduced to a minority government but also becoming the first centre-right government since before World War II to be re-elected, making Reinfeldt the first Moderate politician elected to two consecutive terms as Prime Minister. He is also the longest-serving Moderate Prime Minister in Swedish history.