Sjaak
Sjaak is a given name and a nickname. Notable people with the name include:
- Jacobus Nicolaas Sjaak Brinkkemper, Dutch computer scientist, and professor
- Jakob Frederik Sjaak Köhler, Dutch water polo player and swimmer
- Sjaak Lettinga, Dutch footballer
- Sjaak Lucassen, Dutch long-distance motorcycle rider
- Klaas Pieter Sjaak Pieters, Dutch track cyclist
- Sjaak Polak, Dutch footballer
- Sjaak Rijke, Dutch national held hostage by Al Qaeda in Mali since 2011
- Jesaia Sjaak Swart, Dutch footballer
- Jacob Sjaak Troost, Dutch footballer
- Mehdi Chafi Sjaak, Dutch Rapper
