How Many People Are Named Rennie?
An estimated 1,157 people in the United States have the first name Rennie. It is used for both genders, with 51.9% male. The average bearer is 57 years old, and Rennie peaked in popularity in 1956 with 49 births that year.
Below you will find a full statistical profile of Rennie as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, state-by-state birth registrations, and, when available, a 2020 Census snapshot showing who had the name at that point in time. You can also check how many people share the full name Rennie paired with any surname.
Key Insights
- Rennie is a genuinely unisex name, given to both boys and girls in roughly equal numbers.
Estimated Living Americans
1,157
About 1 in 296,244 people in the U.S.
Rarity
Rare
Predicted Gender
Male
51.9% confidence
Average Age
57
years old
Peak Year
1956
49 births
Total Registered
1,926
since 1880
Gender Distribution for Rennie
Rennie is a genuinely unisex name, used for both males (51.9%) and females (48.1%). Out of 1,926 total births registered, 999 were male and 927 were female.
Rennie as a male name
Ranked #13,650 in 2021
5 male births in 2021
Peak: 1948 (32 births)
Rennie as a female name
Ranked #14,862 in 2024
6 female births in 2024
Peak: 1922 (20 births)
Rennie in the 2020 Census
The 2020 Census recorded 1,346 people with the first name Rennie, which placed it at #10,057 in the published first-name tables. This is a snapshot of people who already had the name in 2020. The estimated living count elsewhere on this page is different: it is a current estimate built from SSA birth records and age-based survival rates, so the two figures are not expected to match exactly.
Read this section as a snapshot of people who already had the name in 2020. The SSA charts elsewhere on this page are still the better way to see how the name rose, fell, or shifted across generations.
Gender in the 2020 Census
In the 2020 Census, Rennie was recorded as predominantly male. Out of 1,346 people with this name in that snapshot, 55.6% were male and 44.4% were female. That is very close to the long-run birth pattern in SSA records, where the name is male 51.9% of the time.
Census Count
1,346
people with this name
Census Rank
#10,057
among Census first names
Frequency Rate
0.45
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Rennie was most commonly recorded among people who identified as White (58.59%). The next largest recorded groups were Black (20.96%) and Asian and Pacific Islander (8.37%).
These percentages describe the people who had the first name Rennie in the 2020 Census. They do not tell you the deeper meaning or origin of the name itself.
2020 Census demographic breakdown
Each row shows a recorded Census category for people with the first name Rennie.
| Group | Share | Count |
|---|---|---|
| White | 58.59% | 791 |
| Black | 20.96% | 283 |
| Asian and Pacific Islander | 8.37% | 113 |
| Hispanic | 8.00% | 108 |
| Two or More Races | 3.11% | 42 |
| American Indian and Alaska Native | 0.96% | 13 |
The Census published separate sex and race/origin tables for first names, so their total counts can differ slightly for the same name. That is why the race section focuses on the demographic mix rather than repeating a second headline count.
Rennie: Popularity Over Time
SSA records for Rennie span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1950s, when 337 babies were registered. Rennie has declined significantly from its peak in the 1950s. Recent registrations are a fraction of what they were at the name's height.
Rennie by Decade
How has Rennie tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Rennie by State
Rennie + Last Name Combinations
How many people share a full name with Rennie as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Rennie
Other first names starting with R with a similar number of bearers.
Rennie: Questions and Answers
How many people in the U.S. are named Rennie?
We estimate approximately 1,157 people named Rennie are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 296,244 Americans share this first name.
Is Rennie a common name?
Rennie is classified as "Rare" and is more popular than 91% of all first names in the SSA database. A total of 1,926 births have been registered with this name since 1880.
When was Rennie most popular?
Rennie reached peak popularity in 1956, when 49 babies were given this name. The average age of a living person named Rennie is approximately 57 years old, reflecting when the name was most commonly given.
How common was Rennie in the 2020 Census?
The 2020 Census recorded 1,346 people with the first name Rennie. That placed it at #10,057 in the published Census first-name tables, or 0.45 people per 100,000.
Why is the Census count different from the living estimate?
Because they measure different things. The Census number is a count of people with the name in 2020. The living estimate is a current model based on SSA birth records and survival rates, so it aims to estimate how many people with the name are alive now.
What does the SSA popularity chart show?
The popularity chart tracks birth registrations, not people currently alive. It shows how often Rennie was given to babies from 1880 through 2024, which is why it is the best tool on the page for seeing long-run naming trends.
What does the Census say about the gender split for Rennie?
In the 2020 Census snapshot, Rennie was recorded as predominantly male. The published split was 55.6% male and 44.4% female.
What does the Census say about the background of people named Rennie?
In the 2020 Census, the first name Rennie was most commonly recorded among people who identified as White (58.59%). The next largest recorded groups were Black (20.96%) and Asian and Pacific Islander (8.37%). These percentages describe the people who had the name in the 2020 Census, not the deeper meaning or origin of the name itself.
Why can the Census sex total and race total differ slightly?
The Census published separate first-name tables for sex and for race and Hispanic origin. Those totals can differ slightly for the same name, so the page uses them as two related snapshots rather than treating them as perfectly interchangeable counts.
Does every first name have Census demographic data?
No. The public Census first-name tables only include names that met the Bureau's publication rules. That means some names on this site will have SSA history but no published Census demographic snapshot.
Is Rennie a male name?
Rennie is predominantly male. 51.9% of people with this name are male. See the gender breakdown above for full details.
Why can Rennie have a lot of living bearers even if it is not trendy now?
Because a name can build up a large population over many decades. Rennie peaked in 1956, and the average living bearer is about 57 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Rennie Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Rennie Smith, Rennie Johnson, Rennie Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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