Lois has been given to about 335,594 people in the United States since 1880. It was most common in 1927, which makes it a interwar name.
Its best year was 1927, when 10,587 babies were given the name, ranking 19th. The typical living American called Lois is about 82 years old today. It is relatively most common in Tennessee, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.