Marcos has been given to about 53,742 people in the United States since 1880. It was most common in 2001, which makes it a millennial-parent name.
Marcos ranks 517th among American boys in 2025, with 579 born that year. Its best year was 2001, when 1,415 babies were given the name, ranking 240th. The typical living American called Marcos is about 26 years old today. It is relatively most common in New Mexico, where it accounts for 0.04% 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.