Over the past 110 years, 15 166 girls have been named Katy. The name Katy ranks 1028th in the United States among the most common names for girls. For the first time more than ten times newborns were named Katy in 1911. The peak of popularity of the name Katy 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.