Jaci has been given to about 5,154 people in the United States since 1880. It was most common in 2005, which makes it a millennial-parent name.
Its best year was 2005, when 221 babies were given the name, ranking 1075th. The typical living American called Jaci is about 23 years old today. It is relatively most common in Louisiana, where it accounts for 0.03% 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.