Over the past 110 years, 11 401 girls and 61 boys have been named Kourtney. The name Kourtney ranks 1215th in the United States among the most common names for girls. For the first time more than ten times newborns were named Kourtney in 1974. The peak of popularity of the name Kourtney came in the 1990s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.