Keller is a surname with several origins. The Irish version, which is the most ancient in origin, comes from the Gaelic surname Ó Ceilechair. In modern German Keller means cellar or basement, but historically it designates a cellarer or winemaker. A Latinized form of "Keller" is "Cellarius".
Keller is an Anglicized version of the Old Irish surname Ó Céilechair (meaning descendant of Céilechar). Céilechair was descended from Cennétig mac Lorcáin King of the Dál gCais in modern-day Clare. Cennétig mac Lorcáin was the ancestor and progenitor of the Keller family, and also of the Kennedys and O'Briens of Munster.
The Anglicized surname in Ireland has many different spellings including: O'Kelleher, Kelaher, Kelliher, Kellar, Keller, McKeller, MacKeller, and O'Keller.
People whose surname is or was Keller include:
- Adam Keller, Israeli peace activist and soldier
- Adolf Keller (1872–1963), Swiss Protestant theologian
- Al Keller, American race car driver
- Albert Keller (1844–1920), German painter
- Albert Galloway Keller (1874–1956), American sociologist and author
- Alfred Keller (1882–1974), German general
- Amanda Keller (born 1962), Australian TV personality and actress
- Andrea Keller (born 1973), Australian jazz musician
- Andreas Keller (born 1965), German field hockey player
- Arthur I. Keller (1867–1924), American illustrator
- Augustin Keller (1805–1883), Swiss politician
- Bernhard Keller (born 1964), Swiss mathematician
- Bill Keller (born 1949), American editor
- Boris Keller (1874–1945), Soviet plant ecologist
- Brad Keller (disambiguation), several people
- Carlos Keller, Chilean academic and politician.
- Carsten Keller, German field hockey player
- Chaim Dov Keller, rabbi and rosh yeshiva in Chicago
- Charlie Keller, US baseball player
- Chris Keller, a fictional character in the Arthur Miller play All My Sons
- Christopher Keller, a fictional character in the American television series Oz
- Clayton Keller, American ice hockey player
- David H. Keller (1880–1966), American science fiction writer
- Dietrich Keller (born 1943), German retired basketball player
- Donald G. Keller (born 1951), American science fiction and fantasy editor and critic
- Elisabetta Keller (1891–1969), Swiss-Italian artist
- Elizabeth C. Keller (1837-1912), American physician and surgeon
- Émile Keller (1828–1909), French writer and politician
- Erhard Keller (born 1944), German ice skater
- Erwin Keller, German field hockey player
- Evelyn Fox Keller, American scientist
- Ferdinand Keller (disambiguation), several people
- Franz Keller (psychologist) (1913–1991), Swiss psychologist, Christian pacifist and left-wing news editor
- Franz Keller (born 1945), West German Nordic combined skier
- Fred S. Keller (1899–1996), American pioneer in experimental psychology
- Frieda Keller (1879–1942), Swiss murderer
- Friedrich von Keller (diplomat) (1873–1960), German diplomat (father of Rupprecht)
- Friedrich von Keller (painter) (1840–1914), German landscape painter
- Friedrich Ludwig von Keller (1799–1860), German-Swiss jurist
- Fyodor Keller, Russian general
- George Keller (academic) (1928–2007), American scholar and academic administrator
- George Keller (architect) (1842–1935), Irish-born American architect and engineer
- George Frederick Keller (1846–?), political cartoonist
- Gerold Keller, Swiss curler
- Gerta Keller (born 1945), American paleontologist
- Gottfried Keller (1819–1890), Swiss writer
- Hannes Keller, Swiss physicist and mathematician
- Hans Keller (1919–1985), Austrian-born British musician and writer
- Hans Peter Keller (1915–1988), German poet
- Harold Keller (1921–1979), American Marine, flag raiser at Iwo Jima
- Heide Keller (1939–2021), German actress
- Helen Keller, American blind and deaf author and activist
- Hubert Keller, French chef
- Jack Keller (artist) (1922–2003), comic book artist
- Jack Keller (athlete), former world record holder, 110 hurdles, set July 1932
- "Gentleman" Jack Keller (poker player) (died 2003), poker player
- Jack Keller (songwriter) (1936–2005)
- Jacob Keller (1568–1631)
- James Keller (disambiguation), several people
- Jan Keller (born 1955), Moravian sociologist, environmentalist and politician
- Jason Keller (born 1970), NASCAR racing driver
- Jennifer Keller, fictional M.D. on the SciFi TV series Stargate Atlantis
- Jerry Keller (born 1937), American pop singer and songwriter
- Jim Keller, American musician
- Jim Keller (engineer)
- Johann Baptist von Keller (1774–1845), German bishop
- Joseph B. Keller (1923–2016), American mathematician
- Karl Keller (1784-1855), German flautist and composer
- Kasey Keller (born 1969), US former soccer player
- Kathryn Keller, American visual artist
- Kevin Lane Keller (born 1956), US professor of marketing
- Klete Keller (born 1982), US Olympic swimmer and convicted felon
- K. T. Keller (1885–1966), president and chairman of Chrysler Corporation, and Defense Department "missile czar" in 1950s
- Laurent Keller (born 1961), Swiss evolutionary biologist
- Louis Keller, assembled and published the New York Social Register
- Marc Keller (born 1968), French footballer
- Maria Keller, American philanthropist
- Mark Keller (born 1965), German actor
- Markus Keller (triathlete) (born 1967), Swiss triathlete
- Marthe Keller (born 1945)
- Matthew Keller (1810–81), Irish-born American agriculturalist, vintner, and distiller
- May Lansfield Keller (1877–1964), American academic and dean
- Mitch Keller (born 1996), American baseball player
- Nuh Ha Mim Keller, Muslim scholar (alim), legal expert and jurist (faqih), translator of classical Arabic texts (Reliance of the Traveller), and Mystic of the Shadhili order of Sufis
- Ott-Heinrich Keller, mathematician
- Otto Keller (footballer)
- Otto Keller (philologist), German classical philologist
- Paul Kenneth Keller (born 1966), convicted arsonist
- Peter G. Keller (1894–1972), New York stamp dealer
- Pius Keller (1825–1904)
- Rainer Keller (1965–2022), German politician (SPD)
- Ric Keller (born 1964), American politician, author, and lawyer
- Rita Keller (1933–2005), All-American Girls Professional Baseball League player
- Robert Keller (disambiguation), several people
- Rod Keller (1900–1954), Canadian general
- Ronny Keller (born 1979), former Swiss hockey player
- Rupprecht von Keller (1910–2003), German lawyer and diplomat (son of Friedrich)
- Sharon Keller (born 1953), controversial Texas Criminal Court of Appeals judge
- Thomas Keller, American chef
- Thomas Keller (card game player), American poker player
- Timothy J. Keller, pastor of Redeemer Presbyterian Church in New York City
- Tina Keller-Jenny (1887–1985), Swiss physician and Jungian psychotherapist
- Ursula Keller (born 1959), Swiss physicist and professor at ETH Zurich
- Wade Keller, editor-in-chief of Pro Wrestling Torch newsletter and website
- Walter Keller (disambiguation), several people
- Wes Keller (born 1946), member of the Alaska House of Representatives
- William Keller (disambiguation), several people