Sadao

♂ Boy

How to Pronounce Sadao

Pronounced sah-DAH-oh /saˈda.o/Medium

Meaning: Sadao is a Japanese masculine name ending in -o, common in men's names. The element sada is often written with a character meaning 'decisive', 'chaste', or 'upright', giving a sense such as 'upright man'; because it depends on the kanji, other readings are possible.Low

In 30 seconds: Sadao is a Japanese masculine name, often read as 'upright man', carried by early Japanese immigrant families. It stayed very rare in the United States (said sah-DAH-oh).

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Origin MediumJapanese

MeaningSadao is a Japanese masculine name ending in -o, common in men's names. The element sada is often written with a character meaning 'decisive', 'chaste', or 'upright', giving a sense such as 'upright man'; because it depends on the kanji, other readings are possible.

U.S. rank (1934)#3232 ↘ Falling

1934 U.S. births7 boys (0.00% of U.S. boys)

Peak year1926

Total births (all-time)≈ 244

Popularity in the U.S. · SSA data

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Sadao is a Japanese masculine name formed with the -o ending common in men's names and sada, often written with a character meaning 'decisive', 'chaste', or 'upright' - so 'upright man', though the exact sense depends on the kanji. It appears in United States birth records among Issei and Nisei families in the early twentieth century, reached its small high around 1926, and its recorded use ran mainly into the mid nineteen-thirties, always rare.

A boy named Sadao belonged to the early Japanese-American community, whose history includes the wartime internment years. The jazz saxophonist Sadao Watanabe later carried the name in Japan. It reads as an authentic, dignified Japanese name of its time.

Did you know? The -o ending of Sadao is a classic close for Japanese boys' names, much as -ko marks many girls' names of the same era.

Overall data confidence 58%

References - Sadao — Japanese masculine; -o ending; sada often 'upright/decisive'; kanji-dependent

Variations

SadaSadeo

Nicknames

Sada

Famous Bearers

★Sadao Watanabe (1933-present)
Japanese jazz saxophonist and composer, a leading figure in Japanese jazz.

If you like Sadao…

Sadako— a like Japanese name sharing the sada element

Isamu— another Japanese boy's name of the immigrant era

Masao— a parallel Japanese -o masculine name

Takeo— a familiar Japanese -o name of similar style

Explore names like Sadao

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Frequently Asked

What does the name Sadao mean?

It is a Japanese masculine name ending in -o, with sada often meaning 'decisive' or 'upright', so 'upright man'; the exact sense depends on the kanji.

How do you pronounce Sadao?

It's said sah-DAH-oh /saˈda.o/, three syllables, stress on the middle.

Is Sadao a boy or girl name?

Sadao is used as a boy's name.

How popular is Sadao?

It was always very rare in the United States, a Japanese heritage name given to only a couple dozen boys a year around the nineteen-twenties.