Oneil is a distinctive boys' name in United States, ranking #8534 in 2015 with 9 recorded births. The name reached its all-time peak in 1996 with 26 births ranking #2889. Since 1996, the popularity has decreased by 65.4%. In 2015, approximately 1 in every 212,918 boys born was named Oneil. FALLING Recent data shows the name is currently falling.