Kastin has been given to about 130 people in the United States since 1880. It was most common in 2015, which makes it a current name.
Its best year was 2015, when 12 babies were given the name, ranking 6887th. The typical living American called Kastin is about 9 years old today.
Source: US Social Security Administration, national and state name files, 2025 release. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.