Mack has been given to about 42,900 people in the United States since 1880. It was most common in 1942, which makes it a midcentury name.
Mack ranks 463rd among American boys in 2025, with 668 born that year. Its best year was 1942, when 847 babies were given the name, ranking 190th. The typical living American called Mack is about 58 years old today. It is relatively most common in Montana, where it accounts for 0.12% 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.