Over the past 110 years, 11 807 girls have been named Kailyn. The name Kailyn ranks 1187th in the United States among the most common names for girls. For the first time more than ten times newborns were named Kailyn in 1985. The peak of popularity of the name Kailyn came in the 2000s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.