In 2025, 10,545 US boys were named William, making it the 9th most common boys’ name of the year, up 1 place from #10 in 2024. That is 102 fewer than the 10,647 boys named William in 2024. Its best rank for boys was #2, reached in 1920. The most boys given the name in a single year was 67,002, in 1947. For comparison, it was #5 in 2015 and #6 in 1950.
Social Security card records list William in every one of the 146 years from 1880 to 2025; in 1880 there were 9,562 babies with the name. In all, 4,215,725 US babies have been given the name, 0.4% of them girls and 99.6% boys. Its busiest decade was the 1950s, with 592,617 babies named William.
Over the 10 years from 2016 to 2025, 127,227 US boys were named William; the busiest of those years was 2016, with 15,810. In 2025 that was about 1 in 162 of the boys in SSA’s list for the year.
Among the states, William ranked highest in Mississippi in 2025, at #2 for boys there. It was in the top 100 in 51 states (counting DC). Related spellings in the SSA files include Liam (359,085 babies since 1880), Bill (161,190 babies since 1880), Will (46,610 babies since 1880) and Guillermo (32,148 babies since 1880). Rarer spellings such as Wilhelm, Willaim and Wiliam are summarised on this page. The open nickname list we use links it to Bela, Bell, Bill, Billy, Wil and Will.