Nymeria (direwolf)

Nymeria is one of five direwolf cubs that is found by the children of House Stark. Nymeria is adopted and raised by Arya Stark.

In the books
In the Song of Ice and Fire novels Nymeria is an exuberent and playful wolf, but is also fiercely defensive of Arya Stark. Arya names Nymeria for the warrior-queen of the Rhoynar who led her people to safety in Dorne, a thousand years before the events of the series.