Over the past 110 years, 17 024 girls have been named Katlyn. The name Katlyn ranks 977th in the United States among the most common names for girls. For the first time more than ten times newborns were named Katlyn in 1982. The peak of popularity of the name Katlyn came in the 1990s and 2000s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.