Rex
Meaning: “king”
About the name Rex
Rex is a boy name with Latin roots, meaning “king”.
It has a vintage, short & sweet feel. In 2025, Rex ranked #859 for boys in the US, with 281 babies given the name. Its peak year since 1940 was 1951. Since 2000, 100% of US babies named Rex were boys.
Etymology
From Latin, meaning “king”.
Name meaning adapted from Wiktionary (“Rex”) by Wiktionary contributors, CC BY-SA 4.0.
- US rank 2025
- #859
- In 2015
- #680
- Babies in 2025
- 281
Popularity of Rex, 1940–2025
Latest SSA data: 2025.
Popularity data: U.S. Social Security Administration national baby names (public domain; names given to at least 5 babies of one sex per year).
Nicknames for Rex
Rex is already short and sweet, so it doesn't usually get a nickname.
Names similar to Rex
Name meanings marked or linked “Wiktionary” are adapted from Wiktionary by Wiktionary contributors, CC BY-SA 4.0; each name page links its source entry.