Vantti- + -la. Adapted from the Swedish name Fantsby, probably from an old given name *Fante, perhaps a vernacular form of Frans, or from fanter(“servant; jester”).[1]
The internal locative cases (inessive, illative and elative) are used with this place name when referring to a location; for example, "in Vanttila" is Vanttilassa.
^ Sirkka Paikkala, editor (2007), Suomalainen paikannimikirja [Book of Finnish Place names] (in Finnish), Helsinki: Karttakeskus, Kotimaisten kielten tutkimuskeskus, →ISBN