Over the past 110 years, 1 494 boys and 93 423 girls have been named Kay. The name Kay ranks 2133th in the United States among the most common names for boys. For the first time more than ten times newborns were named Kay in 1916. The peak of popularity of the name Kay came in the 1920s and 1930s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.