Sjaak

Sjaak is a given name and a nickname. Notable people with the name include:

• Jacobus Nicolaas Sjaak Brinkkemper (born 1958), Dutch computer scientist, and professor
• Jakob Frederik Sjaak Köhler (1902–1970), Dutch water polo player and swimmer
• Sjaak Lettinga (born 1982), Dutch footballer
• Sjaak Lucassen (born 1961), Dutch long-distance motorcycle rider
• Klaas Pieter Sjaak Pieters (born 1957), Dutch track cyclist
• Sjaak Polak (born 1976), Dutch footballer
• Sjaak Rijke, Dutch national held hostage by Al Qaeda in Mali since 2011
• Jesaia Sjaak Swart (born 1938), Dutch footballer
• Jacob Sjaak Troost (born 1959), Dutch footballer
• Sjaak (rapper) (born 1985), Dutch rapper