Definition of "Jax"

"Jacks is short for Jackson?""No, with an X." He makes a cross with his marvelously long index fingers. "Short for nothing. My mother was one of the best-known alcoholics in the French Quarter of New Orleans. I was named after a venerated brand of beer.""You're named after Jax Beer?"He nods morosely. "Somewhere in this world I have a sister named Hurricane. I'm telling you the God's honest truth."

1993, Barbara Kingsolver, Pigs in Heaven, page 81