Over the past 110 years, 50 876 girls and 10 boys have been named Caitlyn. The name Caitlyn ranks 518th in the United States among the most common names for girls. For the first time more than ten times newborns were named Caitlyn in 1980. The peak of popularity of the name Caitlyn 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.