Tatsuo| Gender | Male |
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| Word/name | Japanese |
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| Meaning | Different meanings depending on the kanji used |
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Tatsuo (written: 龍夫, 龍雄, 龍生, 龍男, 龍勇, 竜夫, 竜雄, 竜男, 達夫, 達雄, 達生, 達男, 達郎, 辰夫, 辰雄, 立男, 立郎, 剛男 or 太津朗) is a masculine Japanese given name. Notable people with the name include:
- Tatsuo Endō (actor) (遠藤 太津朗, 1928–2012), Japanese actor
- Tatsuo Endo (engineer) (遠藤 達雄, 1925–1989), Japanese engineer
- Tatsuo Fukuda (福田達夫, born 1967), Japanese politician
- Tatsuo Fujimoto (藤本 達夫, born 1940), Japanese swimmer
- Tatsuo Hasegawa (長谷川 龍雄, 1916–2008), Japanese automotive engineer
- Tatsuo Hirano (平野 達男, born 1954), Japanese politician
- Tatsuo Hori (堀 辰雄, 1904–1953), Japanese writer, poet and translator
- Tatsuo Ichikawa (市川 辰雄, 1916–?), Japanese ice hockey player
- Tatsuo Inagaki (稲垣 立男, born 1962), Japanese artist
- Tatsuo Itoh, American academic
- Tatsuo Jihira (地平 達郎, born 1948), Japanese water polo player
- Tatsuo Kainaka (甲斐中 辰夫, born 1940), Japanese judge
- Tatsuo Kamon (嘉門 達夫, born 1959), Japanese singer-songwriter
- Tatsuo Kawabata (川端 達夫, born 1945), Japanese politician
- Tatsuo Kawai (河相 達夫, 1889–1965), Japanese diplomat and writer
- Tatsuo Kawai (wrestler) (川合 達夫, born 1973), Japanese sport wrestler
- Tatsuo Kinoshita (木下 達生, born 1987), Japanese baseball player
- Tatsuo Kitamura (北村 辰夫, born 1940), Japanese cross-country skier
- Tatsuo Kobayashi (小林 龍生, born 1951), Japanese computer scientist
- Tatsuo Kondō (近藤 龍夫, 1916–1992), Japanese photographer
- Tatsuo Nagai (永井 龍男, 1904–1990), Japanese writer
- Tatsuo Nishida (西田 龍雄, 1928–2012), Japanese linguist
- Tatsuo Sasaki (佐々木 竜雄, born 1942), Japanese sport wrestler
- Tatsuo Satō (director) (佐藤 竜雄, born 1964), Japanese anime director
- Tatsuo Sato (politician) (佐藤 剛男, born 1937), Japanese politician
- Tatsuo Shimabuku (島袋 龍夫, 1908–1975), Japanese karateka
- Tatsuo Sugimoto (杉本 龍勇, born 1970), Japanese sprinter
- Tatsuo Suzuki (cinematographer) (鈴木 達夫, born 1935), Japanese cinematographer
- Tatsuo Suzuki (martial artist) (鈴木 達夫, 1928–2011), Japanese karateka
- Tatsuo Toki (斎 辰雄, 1904–1967), Japanese decathlete
- Tatsuo Utagawa (宇田川 竜男, born 1917), Japanese ornithologist and academic
- Tatsuo Watanabe (渡部 龍雄, born 1928), Japanese ski jumper
- Tatsuo Yada (矢田 立郎, born 1940), Japanese politician
- Tatsuo Yamada (山田 辰夫, born 1956), Japanese actor
- Tatsuo Yamada (karate) (山田 辰雄, 1905–1967), Japanese karateka
- Yamamoto Tatsuo (山本 達雄, 1856–1947), Japanese politician
- Tatsuo Yanagino (柳野龍男), Japanese animator on Lupin the 3rd Part III
- Tatsuo Yoshida (吉田 竜夫, 1932–1977), Japanese illustrator and character designer