Over the past 110 years, 296 boys and 704 747 girls have been named Kathleen. The name Kathleen ranks 4083th in the United States among the most common names for boys. For the first time more than ten times newborns were named Kathleen in 1935. The peak of popularity of the name Kathleen came in the 1940s and 1980s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.