Over the past 110 years, 43 377 boys and 27 girls have been named Willis. The name Willis ranks 481th in the United States among the most common names for boys. For the first time more than ten times newborns were named Willis in 1910. The peak of popularity of the name Willis 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.