Tassilo – also spelled Thassilo – is a male name of West Germanic origin. It is the diminutive form of the name Tasso/Tazzo. Tasso/Tazzo itself is the diminutive form of Taginbert, which is of West Germanic origin and means `glittering as the day`. The components of Taginbert are the Celtic word dago (good) and the Old High German word berah.....