Jac is a moderately popular boys' name in England & Wales, ranking #329 in 2008 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 2008, approximately 1 in every 2,852 boys born was named Jac. STABLE Recent data shows the name is currently stable.