Rex
Rex: name meaning, origin and popularity
Pronunciation (IPA): /ɹɛks/
Meaning and origin of Rex
Root meaning: “king”
- A male given name from Latin coined in the nineteenth century from Latin rex "king," rarely given today.
Etymology
From Latin rēx (“king”). Doublet of rajah and roy.
How popular is Rex?
Since 1880, 141 girls and 60,449 boys in the U.S. have been named Rex (0% girls). Its highest rank for girls was #3610 in 1925. Its highest rank for boys was #170 in 1951. In 2025 it ranked #859 for boys, with 281 babies given the name.
Names similar to Rex
Names that start with the same letters, most popular first.
More Latin boy names
Sibling name ideas for Rex
Sister and brother names that share Rex's Latin roots and are still in the U.S. top 1,000.
Rex FAQ
What does the name Rex mean?
Rex traces back to a root meaning "king". A male given name from Latin coined in the nineteenth century from Latin rex "king," rarely given today. From Latin rēx (“king”). Doublet of rajah and roy.
What is the origin of the name Rex?
Rex is listed as a name of Latin origin.
How popular is the name Rex?
Since 1880, 141 girls and 60,449 boys in the U.S. have been named Rex (0% girls). Its highest rank for girls was #3610 in 1925. Its highest rank for boys was #170 in 1951. In 2025 it ranked #859 for boys, with 281 babies given the name.
Is Rex a boy or girl name?
Rex is mostly a boy name in the U.S.: 141 girls and 60,449 boys since 1880.
Popularity data: U.S. Social Security Administration baby name data, 1880–2025 (names given to 5+ babies per year). Origin and etymology text: Wiktionary, available under CC BY-SA 4.0.