Over the past 110 years, 3 904 738 boys and 10 216 girls have been named William. The name William ranks 5th in the United States among the most common names for boys. 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 1910s and 1920s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.