Kailynne is of American origin, derived from the Irish name Caoilinn. It means 'slender, delicate'. The name gained popularity in the United States during the 1980s and has since been consistently used, though it remains relatively uncommon.
"Kailynne experienced fluctuating popularity between 1997 and 2021, with peak years being 2003 (16 births) and 2011 (16 births). The name's overall usage, however, was relatively low, totaling only 240 births over the span of two decades."