Sadao
Meaningoften steadfast man · Japanese
Sadao is a Japanese boy name often meaning “steadfast man”. In Japan, parents often choose a name as much for the kanji characters behind it as for its sound, so the same name can carry several shades of meaning. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds soft and friendly, it's easy to spell and quick to call across a playground, and it pairs well with middle names of almost any length.
Did you know?
- Hidden namesLook closely: Sadao has the name Ada hiding inside it.
- GenerationSadao peaked in 1926, which makes it a Greatest Generation name, think great-grandparents.
- HistorySadao first shows up in US birth records in 1914, the first year at least 5 babies got it. It has been in use for 111 years since.
US births per million boys, 1914–2025
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Popularity: U.S. Social Security Administration (babies with 5+ births per year).
About the name Sadao
Sadao is a boy name of Japanese origin meaning “often steadfast man”. Its two syllables give it an easy rhythm, and the open vowel at the end makes it sound soft and warm. It was most fashionable in the 1920s, which gives it a vintage, grandparent-chic charm. It's rarely heard today, so it stands out while still being a real, established name.
Origin:Japanese names
More Japanese boy names
- Unisex name: Asa · healer
- Unisex name: Rio · river
- Unisex name: Akari · light, brightness
- Boy name: Kenzo · often healthy third son
- Boy name: Kenji · often strong second son
- Unisex name: Ren · often lotus
- Unisex name: Zen · meditation
- Unisex name: Mars · god of war
Questions about the name Sadao
What does the name Sadao mean?
Sadao means “often steadfast man” and comes from Japanese. Other boy names with a similar meaning include Hamza (“strong, steadfast”), Dhruv (“steadfast, pole star”), Constantine (“steadfast”) and Rakan (“steadfast”).
What is the origin of the name Sadao?
Sadao is Japanese in origin. Other Japanese names to consider are Asa (“healer”), Rio (“river”), Akari (“light, brightness”) and Kenzo (“often healthy third son”).
Is Sadao a boy or girl name?
Sadao is a boy name.
How popular is the name Sadao?
Sadao is rare: fewer than 5 US boys got it in 2025, and it was last given to 5 or more in 1934. It peaked at #1,605 in 1926, so it's a name with history that few kids share today.
What names are similar to Sadao?
If you like Sadao, you might also like Hamza, Dhruv, Constantine and Rakan.
What should I know before naming my baby Sadao?
Sadao is a Japanese boy name often meaning “steadfast man”. In Japan, parents often choose a name as much for the kanji characters behind it as for its sound, so the same name can carry several shades of meaning. A meaning like this gives a child something to grow into, and a good story to tell when someone asks about their name. It sounds soft and friendly, it's easy to spell and quick to call across a playground, and it pairs well with middle names of almost any length. Say it out loud with your last name and any middle names you're considering, and check the initials it makes.