Over the past 110 years, 36 252 girls and 47 boys have been named Nikki. The name Nikki ranks 641th in the United States among the most common names for girls. For the first time more than ten times newborns were named Nikki in 1940. The peak of popularity of the name Nikki came in the 1970s and 1980s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.