Over the past 110 years, 317 315 girls and 858 boys have been named Lois. The name Lois ranks 112th in the United States among the most common names for girls. For the first time more than ten times newborns were named Lois in 1910. The peak of popularity of the name Lois 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.