There are three known artists by this name.

1) Butterfinger was the original name of a Bradford-based rock trio. They released an EP under this name before changing their name to Psychosonic 3.
(http://freespace.virgin.net/unsigned.uk/butterfinger/butterfinger.htm)

2) Butterfinger is also the name of a Canadian band who have released an album of the same name.
(http://www.angelfire.com/indie/butterfinger/main.html - fansite)

3) Butter finger is also Miztani Yukimasa, a Japanese artist most known for the modern jazz track "Wanna Go Somewhere And Chill?", which has appeared on a few compilation albums, notably on Hed Kandi Records. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.