Over the past 110 years, 27 girls and 43 377 boys have been named Willis. The name Willis ranks 12361th in the United States among the most common names for girls. For the first time more than ten times newborns were named Willis in 1923. The peak of popularity of the name Willis 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.