From last.fm:

There are at least 17 artists that have used the name Ghost: 1. A Swedish heavy metal band 2. A Japanese experimental rock band 3. A British trip-hop producer 4. A British dubstep collaboration 5. A Jamaican reggae musician 6. A Japanese visual kei band 7. A Polish death metal band 8. A British electronic producer 9. An American rock band 10. A Swedish rock band 11. An American rock band, now called Ghost Ghost 12. A French death metal band 13. A British dubstep DJ Read more on Last.fm