Jair is of Hebrew origin and translates to 'He enlightens'. It's a name with a rich biblical background, as it was borne by several figures in the Old Testament. The name gained popularity in the 20th century, particularly among Jewish communities around the world.
"The name Jair experienced a significant rise in popularity from the late 1970s onwards, with births jumping from single digits to hundreds per year by the mid-1990s. The peak was reached in 2003 with 480 births."