Over the past 110 years, 4 694 girls and 41 026 boys have been named Kai. The name Kai ranks 1896th in the United States among the most common names for girls. For the first time more than ten times newborns were named Kai in 1961. The peak of popularity of the name Kai came in the 2000s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.