Portuguese and Spanish form derived from Santiago — saint james. The most common Brazilian spelling of the name.
Thiago ranks 50th among American boys in 2025, with 5,840 born that year. Its best year was 2025, when 5,840 babies were given the name, ranking 50th. The typical living American called Thiago is about 4 years old today. It is relatively most common in Maryland, where it accounts for 0.39% 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.