In 2025, 668 US boys were named Mack, making it the 463rd most common boys’ name of the year, up 36 places from #499 in 2024. That is 54 more than the 614 boys named Mack in 2024. Its best rank for boys was #96, reached in 1900. The most boys given the name in a single year was 840, in 1942. For comparison, it was #662 in 2015 and #310 in 1950.
Social Security card records list Mack in every one of the 146 years from 1880 to 2025; in 1880 there were 104 babies with the name. In all, 42,900 US babies have been given the name, 0.4% of them girls and 99.5% boys. Its busiest decade was the 1940s, with 5,686 babies named Mack.
Over the 10 years from 2016 to 2025, 5,311 US boys were named Mack; the busiest of those years was 2025, with 668. In 2025 that was about 1 in 2,557 of the boys in SSA’s list for the year.
Among the states, Mack ranked highest in Utah in 2025, at #155 for boys there. It was not in the top 100 of any state. Related spellings in the SSA files include Mac (11,455 babies since 1880) and Mace (1,977 babies since 1880). Rarer spellings such as Mackie, Mayce and Mahek are summarised on this page. The open nickname list we use links it to Mac and Mc.