Last name Kotani (コタニ 
, Kotani 
, Котани 
) , around the world, is quite a rare surname. The cognomen Kotani is characteristic of Albania, where it is quite a rare surname, Japan, where it is a rare surname, and South Africa. In absolute terms, it most frequently occurs in India, Japan, and Brazil. More frequently, Kotani is the forename as well as the last name.
| VARIANT | COUNTRY |
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| コタニ | Japan |
| Kotani | South Africa, Brazil, United States, India, Japan |
| Котани | Russia |
| كوتاني | Iran |
| kazuko kotani (b. 1893) |
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| kenzō kotani Japanese swordsmith (1909-2003) (b. 1909) |
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| tsuruji kotani (b. 1912) |
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yuriko kotani Japanese comedian |
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| akiko kotani American artist, US (b. 1940) |
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| shin’ichi kotani Japanese mathematician (b. 1946) |
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| mitsuhiro kotani (b. 1937) |
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| roland kotani American politician, US (b. 1954) |
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| akihiko kotani Japanese artist (born 1957), JP (b. 1957) |
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| motoko kotani Japanese mathematician (b. 1960) |
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| yasuko kotani Japanese photographer (b. 1962) |
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| hiroki kotani Japanese mixed martial artist, JP (b. 1971) |
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| ai kotani researcher |
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| jun-ichi kotani researcher |
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| yuki kotani researcher ORCID ID = 0000-0002-9532-2859 |
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