Uncertain, perhaps named after a lake or river, the name of which could derive from kiskoa or dialectal kisko(“piece of birchbark”) (whence modern kisko(“rail”)).[1]
The internal locative cases (inessive, illative and elative) are used with this place name when referring to a location; for example, "in Kisko" is Kiskossa.
^ Sirkka Paikkala, editor (2007), Suomalainen paikannimikirja [Book of Finnish Place names] (in Finnish), Helsinki: Karttakeskus, Kotimaisten kielten tutkimuskeskus, →ISBN