How Many People Are Named Rex?
people named Rex are alive in the United States today (estimate)
About 1 in 9,667 people in the US has this name
Based on 60,590 babies named Rex in Social Security records from 1880 to 2025, and the share of each birth year still alive in 2025.
Popularity Rank
💎 Rare
Peak Year
1,505 births
Trend
Stable (last 10 years)
📖 Name Origin & Meaning
Meaning:
From Latin rex "king". It has been used as a given name since the 19th century.
Source of the meaning, origin, pronunciation and related names: Behind the Name.
⚧ Gender Distribution
Almost all of the babies given the name Rex (99.8%) were boys.
👥 Age Distribution
The average person named Rex alive today is about 51 years old, and 52% are 60 or older. Half of them were between 31 and 70 in 2025.
📈 Popularity Over Time
Rex first appears in the records in 1880 and was given most often in 1952, to 1,505 babies. In 2025, 281 babies got the name.
Babies given the name each year, 1880 to 2025
🏆 Rank History
Rex has never been one of the 100 most popular boys' names. Its best rank was #170, in 1951. In 2025 it ranked #859.
| Boys | |
|---|---|
| Rank in 2025 | #859 |
| Best rank | #170 (1951) |
| Years in the top 100 | None |
| Rank in its biggest decade | #198 in the 1950s |
📍 State-Wise Distribution
People named Rex alive today, by the state where they were born (estimate; state records start in 1910).
More people named Rex were born in California than in any other state: about 3,337 of those alive today. Compared with the national rate in the same years, Rex was given 4.5 times as often in Utah, 3.6 times in Idaho and 3.1 times in Kansas.
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