Silvertongue

From Srafopedia

Lyra Belaqua's earned name, Iorek Byrnison gives her this name when she fools Iofur Raknison, the King of the Bears, by telling him that she is the dæmon of Iorek Byrnison and that she is willing to change sides for the "strongest bear". Iofur, who is obessed with the idea of being human, specifically owning his own dæmon, follows Lyra's request. Lyra meets up with Iorek and confesses to what she has done, thinking Iorek would reprimand her or punish her. To her surprise, Iorek readily forgives her and calls her "Lyra Silvertongue". She adopts Silvertongue as her new surname, both out of pride that Iorek has gifted her with such a name and because she is estranged from her father after his murder of Roger Parslow.