Olli is a Finnish variant of the name Olavi, which is based on the Swedish name Olle. It is also a Dutch children's book character and a stuffed toy, created in 2004 by Dutch designer and film director Hein Mevissen along with writer Diederiekje Bok. The character Olli was initially used for a bottled mineral water brand and later became a symbol of Rotterdam and a mascot for the professional football club Feyenoord.