Kaj is a given name of unknown origin, particularly common in the Nordic countries, loaned from the Continent. It might be derived from Frisian Kaye (hen) or Latin Caius. In Denmark and Norway, the name is predominantly male, while in Sweden and Finland, the name is unisex (with the female name possibly having a different origin).

Notable persons with the given name include:

• Kaj Arnö (born 1963), Finland-Swedish IT-entrepreneur
• Kaj Birket-Smith (1893–1977), Danish philologist and anthropologist
• Kaj Birksted (1915–1996), Danish fighter pilot
• Kaj Björk (1918–2014), Swedish Social Democratic politician
• Kaj Busch (21st century), Australian television presenter
• Kaj Christiansen (1921–2008), Danish football forward
• Kaj Chydenius (born 1939), Finnish composer
• Kaj Czarnecki (1936–2018), Finnish Olympic fencer
• Kaj Franck (1911–1989), Finnish designer
• Kaj Frederiksen (1916–1991), Danish boxer
• Kaj Gnudtzmann (1880–1948), Danish gymnast
• Kaj Aksel Hansen (1917–1987), Danish footballer
• Kaj Hansen (footballer born 1940) (1940–2009), Danish footballer
• Kaj Hasselriis (born 1974), Canadian journalist
• Kaj Ikast (1935–2020), Danish politician
• Niels Kaj Jerne (1911–1994), Danish immunologist
• Kaj Leo Johannesen (born 1964), Prime Minister of the Faroe Islands
• Kaj Ulrik Linderstrøm-Lang (1896–1959), Danish scientist
• Kaj Munk (1898–1944), Danish playwright
• Kaj Poulsen (born 1942), Danish footballer in the striker position
• Kaj Ramsteijn (born 1990), Dutch footballer
• Kaj Schmidt (born 1926), Danish Olympic sprint canoer who competed in the early 1960s
• Kaj Skagen (born 1949), Norwegian writer
• Kaj Stenvall (born 1951), Finnish artist
• Kaj Aage Gunnar Strand (1907–2000), Danish astronomer
• Kaj Sylvan (1923–2020), Danish Olympic sprint canoer who competed in the late 1950s
• Kaj Uldaler (1906–1987), Danish amateur football player

• All pages with titles beginning with Kaj
• All pages with titles containing Kaj
• Kaj (disambiguation)
• András Kaj (born 1977), Hungarian footballer
• Kølig Kaj (born 1971), Danish rapper
• Kaja (name)

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This page lists people with the surname Kaj.
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