Over the past 110 years, 6 boys and 55 938 girls have been named Kaitlin. The name Kaitlin ranks 11546th in the United States among the most common names for boys. For the first time more than ten times newborns were named Kaitlin in 1990. The peak of popularity of the name Kaitlin came in the 1990s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.