In 2025, 736 US boys were named Lewis, making it the 433rd most common boys’ name of the year, down 1 place from #432 in 2024. That is 2 more than the 734 boys named Lewis in 2024. Its best rank for boys was #30, reached in 1880. The most boys given the name in a single year was 2,712, in 1921. For comparison, it was #568 in 2015 and #132 in 1950.
Social Security card records list Lewis in every one of the 146 years from 1880 to 2025; in 1880 there were 517 babies with the name. In all, 156,636 US babies have been given the name, 0.6% of them girls and 99% boys. Its busiest decade was the 1920s, with 25,491 babies named Lewis.
Over the 10 years from 2016 to 2025, 6,068 US boys were named Lewis; the busiest of those years was 2025, with 736. In 2025 that was about 1 in 2,321 of the boys in SSA’s list for the year.
Among the states, Lewis ranked highest in Vermont in 2025, at #116 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Louis (409,317 babies since 1880), Luis (294,500 babies since 1880), Louie (33,338 babies since 1880) and Luigi (4,305 babies since 1880).