If this non-artist appears in your charts, do last.fm and yourself a favor. Fix your tags by putting the actual artist name in the artist field. The exact spelling is "Sunwølf".
... I'm not sure if the above is accurate, there does seem to be a band called Sunwolf (no ø) which is different from Sunwølf, and has a record listed here correctly. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.