Over the past 110 years, 163 126 girls and 25 boys have been named Kaitlyn. The name Kaitlyn ranks 217th in the United States among the most common names for girls. For the first time more than ten times newborns were named Kaitlyn in 1977. The peak of popularity of the name Kaitlyn 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.