[ 2 syll. rei-(l)ly, re-i-lly ] The baby boy name Reilly is also used as a girl name, but it is somewhat more common for boys. It is pronounced as RiyLiy- †. Reilly is used chiefly in the English language, and it is derived from Celtic and Old English origins.
Reilly is a variant of the name Raghallach (Irish) in the English language.
Reilly is also a variant of the name Riley (English).
Reilly is unusual as a baby name for boys. Its usage peaked modestly in 2002 with 0.010% of baby boys being given the name Reilly. Its ranking then was #821. The baby name has since experienced a fall in popularity, and is today of irregular use. Among the group of boy names directly linked to Reilly, Riley was the most commonly used in 2012. There were times from 1997 to 2004 that the name Reilly was given more often to girls, but it is slightly more popular as a baby boy name today.
† Pronunciation for Reilly: R as in "race (R.EY.S)" ; IY as in "eat (IY.T)" ; L as in "lay (L.EY)"