first name
REX
of 53,615 first names recorded in the 2020 Census
Of the 36,166 people named Rex, 84.2% reported their origin as White, 5.3% as Asian or Pacific Islander and 3.3% as Black. Virtually all are male (99.7%). These count how people described themselves on the 2020 Census, not where the name comes from.
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Rex peaked in 1952, when 1,505 babies got the name.
At least 60,590 babies have been given the name since 1880. Years SSA withheld, because fewer than 5 were born, are skipped rather than drawn as zero. * 2025 is the newest year published and it undercounts: a card application is filed some time after a birth.
Rex by decade
Among all names given to American babies, its best decade was the 1950s, when it ranked #419. The largest share of babies named Rex, 37.3%, were born during the baby boom (1946–1964).
Rank counts both sexes together, among every name SSA recorded that decade; the number under it is births. The 2020s run only to 2025. Generation years follow Pew Research Center, which has not named a generation after 2012.
Where Rex is most common
Compared with all babies born in each state since 1910, Rex has been most common in Utah (3.7×), Idaho (3.5×), and Kansas (3.4×), and least common in New Jersey (0.08×).
54,971 births recorded by state, 1910–2025. 2× means twice as common as nationally. States with fewer than 30 such births are left blank, and SSA withholds any year with fewer than 5 in a state, so small states read low.
Either side of Rex
Spelled almost the same
One first name in the 2020 Census spelled within a letter or two of Rex, most common first.
Also a last name
As a last name, Rex ranks #5,990 of 156,621, with 5,532 people. See Rex as a last name
Compare
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