Over the past 110 years, 55 938 girls and 6 boys have been named Kaitlin. The name Kaitlin ranks 490th in the United States among the most common names for girls. For the first time more than ten times newborns were named Kaitlin in 1977. The peak of popularity of the name Kaitlin 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.