Rancer

"Rancer, to the Builders."

- Lord Commander Jeor Mormont

Rancer is an unidentified background character in the first season. He is a newly made Builder of the Night's Watch, of the same group of recruits as Jon Snow.

Season 1
Rancer is present during the speech Lord Commander Jeor Mormont gave to the "graduating" recruits. He is assigned to the Builders.

In the books
In the A Song of Ice and Fire novels, there's no member of the Night's Watch called Rancer.