There are at least nine artists with this name:
1. A thrash metal band from the Netherlands
2. A doujin artist from Japan
3. A darkwave group from the United States
4. A black metal band from France
5. A band from Poland later called Trauma
6. A band from Portugal later called ThanatoSchizO
7. A band from Greece later called Nigel Foxxe's INC.
8. A death metal band from Belgium
9. A thrash metal band from Argentina
10. A goth band from Italy.

Read more about Thanatos on Last.fm.