Rex: a male name of Latin origin meaning "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent".It derives from the Latin word "*H3RḖǴS > rēx > rēgis".
Rex is a masculine name that means "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent". Its Latin origins reflect deep cultural values and traditions that have been passed down through generations. Parents choosing this name often appreciate its profound significance and timeless appeal.
Quick Facts About Rex
Quick facts about Rex
Origin
Latin
Gender
Boy name
Popularity
Moderately popular
Researched by Name Doctor Linguistics Team
Our names are verified by professional linguists with expertise in etymology and cultural naming traditions.
Last reviewed: November 2025
Meaning
It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state.
Etymology & Details
Name Root
*H3RḖǴS > rēx > rēgis
How to Pronounce Rex
Rex is pronounced /rɛks/(Latin)
Step-by-step pronunciation guide:
Break it into syllables: Rex
Say it like: "REHKS"
Practice saying it naturally a few times
✓Pronunciation verified by linguistic sources
Usage & Popularity
Rex is predominantly used in english speaking communities, where it maintains strong cultural connections and traditional significance.
english
Frequently Asked Questions About Rex
What does the name Rex mean?
Rex means "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state.". The name comes from *H3RḖǴS > rēx > rēgis. This latin name has been passed down through generations, carrying its meaning across different cultures and time periods. Parents who choose Rex for boys often connect with the name's meaning of "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state." as a quality they hope to see in their child. While not the most common choice, Rex's meaningful roots have given it staying power among parents looking for a name with substance.
What is the origin of the name Rex?
Rex is a latin name. The name traces back to *H3RḖǴS > rēx > rēgis. The name remains closely tied to english naming traditions while occasionally appearing in other cultures. The latin meaning "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state." reflects values important in the culture where this name first appeared.
Is Rex a boy or girl name?
Rex is a boy's name. The name has been used for boys across many generations, maintaining its masculine character through different eras and cultures. In latin tradition, Rex has historically been given to boys. The meaning "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state." carries well for a son, giving the name lasting appeal.
How do you pronounce Rex?
Rex is pronounced "/rɛks/". This pronunciation follows la language patterns. As a single-syllable name, Rex is quick to say and easy to call out. If you're unfamiliar with latin names, listening to a native speaker say Rex can help you catch the right rhythm and emphasis.
How popular is the name Rex?
Rex is somewhat common, familiar to most people. With moderate popularity, Rex offers familiarity without being everywhere. It's the kind of name people recognize but don't hear every day. Rex's popularity may vary between latin communities and the broader population, where naming trends differ. The name's meaning of "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state." likely influences its appeal, as parents often choose names that express values or hopes for their children. Among boys' names, Rex holds its own, appealing to parents who value distinctive options.
Where is the name Rex commonly used?
Rex is used primarily in english naming traditions. Though latin in origin, Rex found a home in other cultures where it resonated with local naming preferences. The meaning "It is a male given name coined in the 19th-century from the Latin “rex,” meaning “king, regent.” In turn, this name derives From the Proto-Indo-European “*herḗǵs” (ruler, king). Cognates include Sanskrit “rājan” (king) and Old Irish “rí” (king). He has rarely bestowed on children today. The King of Rome (Rex Romae), was the chief magistrate of the Roman Kingdom. Early Rome was not self-governing and was ruled by the king (Rex), sometimes from a nearby Etruscan city-state." carries universal appeal, helping explain why different cultures adopted Rex into their naming traditions. A child named Rex will likely find their name recognized in multiple countries, which can be an advantage for families with international connections or who value global accessibility. Across these cultures, Rex is given to boys, maintaining consistent gender association.
Sources: Etymology verified through linguistic research including Oxford Dictionary of First Names, Behind the Name, and academic etymology databases.