Jac is a moderately popular boys' name in England & Wales, ranking #305 in 2001 with 89 recorded births. The name reached its all-time peak in 2004 with 134 births ranking #246. Since 1996, the popularity has increased by 48.3%. In 2001, approximately 1 in every 3,234 boys born was named Jac. STABLE Recent data shows the name is currently stable.