Over the past 110 years, 96 051 girls and 31 boys have been named Sierra. The name Sierra ranks 348th in the United States among the most common names for girls. For the first time more than ten times newborns were named Sierra in 1940. The peak of popularity of the name Sierra came in the 1990s and 2000s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.