Ruutu is a Finnish surname. It means 'square', 'diamond', or 'box' (wikt:ruutu).
People with the surname Ruutu include:
In sports: Jarkko Ruutu (born 1975), Finnish professional ice hockey player, brother of Mikko and Tuomo Mikko Ruutu (born 1978), Finnish professional ice hockey player Tuomo Ruutu (born 1983), Finnish professional ice hockey player
In other fields: Paula Ruutu (1906 - 1990), Finnish educator and politician Yrjö Ruutu (1887 – 1956), Finnish professor of political sciences
See also Christian Ruuttu (born 1964), retired Finnish professional ice hockey player Ruutu.fi, a Finnish television streaming service operated by Nelonen Media