Tammy has been given to about 333,407 people in the United States since 1880. It was most common in 1963, which makes it a boomer-era name.
Its best year was 1963, when 21,246 babies were given the name, ranking 12th. The typical living American called Tammy is about 59 years old today. It is relatively most common in New Jersey, 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.