How Many People Are Named Reiko?
An estimated 513 people in the United States have the first name Reiko. It is predominantly female (97.2%). The average bearer is 39 years old, and Reiko peaked in popularity in 1975 with 29 births that year.
Below you will find a full statistical profile of Reiko 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 Reiko paired with any surname.
Estimated Living Americans
513
About 1 in 668,137 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
97.2% confidence
Average Age
39
years old
Peak Year
1975
29 births
Total Registered
690
since 1880
Gender Distribution for Reiko
Reiko is predominantly female (97.2%), though 19 male births have been registered. It functions as a unisex name for a small percentage of bearers.
Reiko as a male name
Ranked #10,541 in 2021
7 male births in 2021
Peak: 2021 (7 births)
Reiko as a female name
Ranked #10,977 in 2023
9 female births in 2023
Peak: 1975 (23 births)
Reiko: Popularity Over Time
SSA records for Reiko span from the 1920s to the 2020s, covering 10 decades of naming data. The most popular decade for this name was the 1970s, when 145 babies were registered. Reiko has declined significantly from its peak in the 1970s. Recent registrations are a fraction of what they were at the name's height.
Reiko by Decade
How has Reiko 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.
Reiko by State
Reiko + Last Name Combinations
How many people share a full name with Reiko as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Reiko
Other first names starting with R with a similar number of bearers.
Reiko: Questions and Answers
How many people in the U.S. are named Reiko?
We estimate approximately 513 people named Reiko 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 668,137 Americans share this first name.
Is Reiko a common name?
Reiko is classified as "Very Rare" and is more popular than 84.8% of all first names in the SSA database. A total of 690 births have been registered with this name since 1880.
When was Reiko most popular?
Reiko reached peak popularity in 1975, when 29 babies were given this name. The average age of a living person named Reiko is approximately 39 years old, reflecting when the name was most commonly given.
Is Reiko a female name?
Reiko is predominantly female. 97.2% of people with this name are female. See the gender breakdown above for full details.
How many Reiko Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Reiko Smith, Reiko Johnson, Reiko 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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