Ailsa has been given to about 538 people in the United States since 1880. It was most common in 2003, which makes it a millennial-parent name.
Its best year was 2003, when 19 babies were given the name, ranking 6061st. The typical living American called Ailsa is about 25 years old today.
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.