The name Jax is a boy's name . Jax is ranked #222 on our popularity charts and is often added to lists like Nicknames for Boys and discussed in our forums with posts like "Build a sibling set together!".
From the experts:
Jax is the Dex-Jex-Pax type of x-ending cool -- possibly too cool -- variation of Jack or nickname for Jaxon or Jackson.
Jax was a soap opera character name way back when; most recently he's been seen as Jackson "Jax" Teller, the central character on Sons of Anarchy, the national president of the Sons of Anarchy Motorcycle Club.