Arnulfo has been given to about 6,316 people in the United States since 1880. It was most common in 1992, which makes it a Gen X and millennial name.
Its best year was 1992, when 119 babies were given the name, ranking 988th. The typical living American called Arnulfo is about 42 years old today. It is relatively most common in California, where it accounts for 0.00% of births.
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.