Rex
Simply the Latin word rex, "king." English speakers adopted it as a given name in the nineteenth century.
Rex in 2025
Rex was given to 281 babies in the United States in 2025, making it the 1,775th most popular name of the year. That is roughly one in every 11,798 babies born.
The history of Rex
Rex reached its highest point in 1952, when 1,505 babies were given the name, ranking 373rd that year. Its best-ever ranking was 366th, in 1951.
Across the 146 years of records since 1880, 60,590 babies have been named Rex. Half of them were born before 1955, which places the name's centre of gravity with the Baby Boomers.
Rex by decade
| Decade | Babies named Rex | Best rank |
|---|---|---|
| 1880s | 183 | 726 |
| 1890s | 305 | 792 |
| 1900s | 497 | 687 |
| 1910s | 3,253 | 509 |
| 1920s | 5,660 | 475 |
| 1930s | 5,961 | 440 |
| 1940s | 6,682 | 446 |
| 1950s | 13,543 | 366 |
| 1960s | 8,758 | 455 |
| 1970s | 3,366 | 792 |
| 1980s | 2,543 | 1,069 |
| 1990s | 1,740 | 1,486 |
| 2000s | 2,048 | 1,647 |
| 2010s | 3,945 | 1,271 |
| 2020s | 2,106 | 1,392 |
Where Rex is heading
Rex has fallen 25% over the past decade, from 374 babies in 2015 to 281 in 2025.
Names like Rex
Names that rose and fell at the same time as Rex.