Champ

Champ is short for champion, tracing back through Old French champion to the Late Latin campio, a fighter — a word many etymologists connect, as a likely cognate rather than a direct descendant, to the Latin campus, meaning "field," the ground where contests were held. It's also long served as a casual, friendly term of address, an affectionate way of calling someone a good sport, as in "way to go, champ."

It's a name that radiates encouragement, well suited to a pet who tries hard at everything, whether that's chasing a ball, learning a new trick, or just being an all-around good sport. Simple, upbeat, and easy to shout across a yard.

Etymology & pronunciation from Wiktionary (CC BY-SA 4.0).