Alastair has been given to about 1,364 people in the United States since 1880. It was most common in 2025, which makes it a current name.
Its best year was 2025, when 67 babies were given the name, ranking 2147th. The typical living American called Alastair is about 13 years old today. It is relatively most common in Oregon, where it accounts for 0.02% 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.