Oneil is a distinctive boys' name in United States, ranking #6252 in 2017 with 14 recorded births. The name reached its all-time peak in 1996 with 26 births ranking #2889. Since 1996, the popularity has decreased by 46.2%. In 2017, approximately 1 in every 132,166 boys born was named Oneil. FALLING Recent data shows the name is currently falling.