Jaak

Jaak is a version of the names Jacob and James in the Estonian language.

People named Jaak include:
 * Jaak Aab (born 1960), Estonian politician
 * Jaak Aaviksoo (born 1954), Estonian politician and physicists
 * Jaak Allik (born 1946), Estonian politician and theatre director
 * Jaak De Boever (born 1937), Belgian racing cyclist
 * Jaak Boon (born 1948), Belgian television writer, director and producer
 * Jaak Gabriëls (born 1943), Belgian politician
 * Jaak Huimerind (born 1957), Estonian architect
 * Jaak-Heinrich Jagor (born 1990), Estonian hurdler
 * Jaak Herodes (born 1944), Estonian politician
 * Jaak Joala (1950–2014), Estonian singer
 * Jaak Jõerüüt (born 1947), Estonian writer and politician
 * Jaak Juske (born 1976), Estonian politician
 * Jaak Kangilaski (1939–2022), Estonian art historian and educator
 * Jaak Kärner (1892–1937), Estonian sport shooter
 * Jaak Kilmi (born 1973), Estonian film director and producer
 * Jaak Leimann (born 1941), Estonian economist and politician
 * Jaak-Nicolaas Lemmens (1823–1881), Belgian organist and composer
 * Jaak Lipso (1940–2023), Estonian basketball player
 * Jaak Madison (born 1991), Estonian politician
 * Jaak Mae (born 1972), Estonian cross-country skier
 * Jaak Panksepp (1943–2017), Estonian-American psychologist, psychobiologist and neuroscientist
 * Jaak Peetre (1935–2019), Estonian-Swedish mathematician
 * Jaak Põldma (born 1988), Estonian tennis player
 * Jaak Prints (born 1981), Estonian actor
 * Jaak Salumets (born 1949), Estonian basketball player and coach
 * Jaak Tamleht (1942-1986), Estonian actor
 * Jaak Urmet, better known as Wimberg (born 1979), Estonian poet and writer
 * Jaak Uudmäe (born 1954), Estonian triple jumper
 * Jaak Valge (born 1955), Estonian historian and politician
 * Jaak van Velthoven (born 1951), Belgian motocross rider
 * Jaak van Wijck (1870–1946), Dutch painter