How Many People Are Named Caillou?
An estimated 244 people in the United States have the first name Caillou. It is almost exclusively a male name. The average bearer is 20 years old, and Caillou peaked in popularity in 2001 with 35 births that year.
Below you will find a full statistical profile of Caillou as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Caillou paired with any surname.
Estimated Living Americans
244
About 1 in 1,404,731 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
20
years old
Peak Year
2001
35 births
Total Registered
247
since 1880
Gender Distribution for Caillou
Caillou is almost exclusively a male name. Out of 247 total births registered, 100.0% were male.
Caillou as a male name
Ranked #12,581 in 2017
5 male births in 2017
Peak: 2001 (35 births)
Caillou: Popularity Over Time
SSA records for Caillou span from the 2000s to the 2010s, covering 2 decades of naming data. The most popular decade for this name was the 2000s, when 184 babies were registered. While Caillou is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Caillou by Decade
How has Caillou 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.
Caillou by State
Caillou + Last Name Combinations
How many people share a full name with Caillou as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Caillou
Other first names starting with C with a similar number of bearers.
Caillou: Questions and Answers
How many people in the U.S. are named Caillou?
We estimate approximately 244 people named Caillou 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 1,404,731 Americans share this first name.
Is Caillou a common name?
Caillou is classified as "Very Rare" and is more popular than 76.8% of all first names in the SSA database. A total of 247 births have been registered with this name since 1880.
When was Caillou most popular?
Caillou reached peak popularity in 2001, when 35 babies were given this name. The average age of a living person named Caillou is approximately 20 years old, reflecting when the name was most commonly given.
Is Caillou a male name?
Caillou is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Caillou Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Caillou Smith, Caillou Johnson, Caillou 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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