Over the past 110 years, 110 208 girls and 34 boys have been named Caitlin. The name Caitlin ranks 311th in the United States among the most common names for girls. For the first time more than ten times newborns were named Caitlin in 1957. The peak of popularity of the name Caitlin came in the 1980s and 1990s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.