[Sam you helped the Mirkwood elf. The one who named Bilbo Baggins Elf-friend.]

Elvenking I am styled, but most here simply call me Thranduil whether I permit it or no. Why should I deny you the liberty others take freely?

[But there's still a small smile at the courtesy. And really, Sam saved his life. He's earned whatever the equivalent is of first name basis in a world where no one has a last name (except hobbits but they're weird).]