Surname Tsutsui (ツツイ 
, Tsutsui 
, Цуцуи 
) , throughout the world, is quite a rare last name. The family name Tsutsui is characteristic of Hong Kong, where it is a rare surname, Belgium, and Japan. In absolute terms, this name is the most popular in the United States, Japan, and Brazil. More frequently, Tsutsui is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ツツイ | Japan |
| Tsutsui | China, Japan, United States, Brazil, Poland |
| Цуцуи | Russia |
Cuki, Kunichiku, Susui, Tochiku, Toi, Totsugi, Totsuki, Tozuki, Tsuduki, Tsuguchi, Tsujiku, Tsuki, Tsukushi, Tsutsugi, Tsutsuki, Tsuzuki, Tsuzuku, Tsuzura, Tuduki, Tuduku, Tudura, Tuguchi, Tuguti, Tuki, Tukidi, Tukiji, Tukushi, Tukusi, Tutui, Tutuki, Tuzuki, Tuzura, Țuțui, Тои, Тсутсуи, Цуцуй, and ทซุทซุอิ
| tsutsui junkō [筒井順弘] (b. 1350) |
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| tsutsui jun'ei (b. 1419) |
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| tsutsui junson (b. 1451) |
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| tsutsui junkō [筒井順興] (b. 1484) |
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| tsutsui junsei [筒井順政] (b. 1550) |
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| tsutsui jōkei (1550-1615) (b. 1550) |
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| tsutsui yoshiyuki (b. 1550) |
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| tsutsui junsei [筒井順正] (b. 1584) |
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| tsutsui masanori (b. 1778) |
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| shigeo tsutsui Japanese soldier in China, JP (b. 1920) |
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shan tsutsui American politician, US (b. 1971) |
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| minoru tsutsui (b. 1918) |
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| michio tsutsui (b. 1947) |
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| mario tsutsui Brazilian judoka, BR (b. 1958) |
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| william tsutsui American academic, author, economic historian, Japanologist and university administrator, US (b. 1963) |
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