Jac is a moderately popular boys' name in England & Wales, ranking #258 in 2003 with 119 recorded births. The name reached its all-time peak in 2004 with 134 births ranking #246. Since 1996, the popularity has increased by 98.3%. In 2003, approximately 1 in every 2,517 boys born was named Jac. STABLE Recent data shows the name is currently stable.