Kiefer is German for jaw(-bone) or pine tree.
It may also be a variation of the German word Küfer, meaning cooper.
As a surname Notable people with the surname include: Adolph Kiefer (1918–2017), American Olympic swimmer Anselm Kiefer (born 1945), German painter and sculptor Bertrand Kiefer (born 1955), Swiss physician and ethicist David Kiefer (born 1984), American basketball coach Friedrich Kiefer (1897–1985), German copepodologist George W. Kiefer (1891-1943), American lawyer and politician George Kiefer (soccer), American soccer coach at the University of South Florida Jack Kiefer (golfer) (1940–1999), American professional golfer Jack Kiefer (statistician) (1924–1981), American mathematical-statistician and Professor at Cornell University and University of California, Berkeley Jakob Kiefer (1919–1991), German Olympic gymnast
Joscha Kiefer (born 1982), German actor Nat G. Kiefer (1939–1985), American politician who served in the Louisiana State Senate Nicholas M. Kiefer, statistician and economics professor at Cornell University Nicolas Kiefer (born 1977), German Olympic tennis player Lee Kiefer (born 1994), American Olympic foil fencer
As a given name Notable people with Kiefer as a forename include: Kiefer (musician) (born 1992), American pianist and producer Kiefer Sherwood (born 1995), American ice hockey player Kiefer Sutherland (born 1966), Canadian television and film actor Kiefer Ravena (born 1993), Filipino basketball player
Fictional characters Notable fictional characters include: Kiefer, the Prince of Estard from Dragon Quest VII.
See also Keifer (disambiguation) Kieffer Kefir