Oneil is a distinctive boys' name in United States, ranking #7409 in 2014 with 11 recorded births. The name reached its all-time peak in 1996 with 26 births ranking #2889. Since 1996, the popularity has decreased by 57.7%. In 2014, approximately 1 in every 174,585 boys born was named Oneil. FALLING Recent data shows the name is currently falling.