Luckwearer
From Tolkien Gateway
Luckwearer was one of several names and titles given to himself by Bilbo Baggins during his encounter with the dragon Smaug. Bilbo made these titles intentionally obscure and mysterious: 'Luckwearer' is a reference to the Magic Ring Bilbo wore, and his extraordinary good luck - as he thought - in finding it within the Goblins' dark tunnels.