Over the past 110 years, 31 boys and 96 051 girls have been named Sierra. The name Sierra ranks 8009th in the United States among the most common names for boys. For the first time more than ten times newborns were named Sierra in 1978. The peak of popularity of the name Sierra came in the 1970s and 2000s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.