The name Thorin is a boy's name of Norse origin meaning "brave, daring one". Thorin and discussed in our forums with posts like "Middle name for a First name!".
From the experts:
From the verb að þora, meaning "to dare." This is a dwarf's name that first appeared in the thirteenth century mythology compilation Prose Edda, which, along with the Poetic Edda, represents nearly all of pagan Scandinavian mythology. Tolkien later used the name for character Thorin II Oakenshield of The Hobbit.