Over the past 110 years, 10 216 girls and 3 904 738 boys have been named William. The name William ranks 1284th in the United States among the most common names for girls. For the first time more than ten times newborns were named William in 1910. The peak of popularity of the name William came in the 1920s and 1930s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.