Worldwide, Tadashi (正 
, Tadashi 
, タダシ , among others...) is a widespread predominantly boy's, but scarcely feminine first name. The first name Tadashi is characteristic of China, where it is quite a common predominantly masculine, but very infrequently girly name, Japan, where it is quite a rare male name, and Bolivia, where it is a rare masculine name. Measured by absolute frequency, it most frequently occurs in China, Japan, and the United States. Also, Tadashi is the last name as well as the forename.
Tadashi is also a prevalent name for the fictitious and mythical characters: Dick Grayson , the one of several fictional characters using the identity Robin, Batman & Robin; Richard Castle , the fictional character in the television series Castle; Dick Dastardly , the fictional cartoon character, Scoob!; Dick Dastardly , the main antagonist in the 2020 animated film 'Scoob!' and Tadashi Hamada , the character in Disney's Big Hero 6, and in many other works.
| matsura tadashi daimyo of the mid- to late-Edo period; 6th lord of Hirado-Shinden Domain (1769-1803) (b. 1769) |
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tadashi kameda American baseball player (1912-1976), US (b. 1912) |
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tadashi kuriki Brazilian politician, BR (b. 1940) |
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| tadashi uotani (b. 1895) |
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| tadashi satō (b. 1900) |
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| tadashi mamiya Japanese painter (b. 1911) |
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| tadashi nitō (b. 1908) |
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| tadashi shinbori (b. 1912) |
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| tadashi sato American artist (1923-2005), US (b. 1923) |
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| tadashi yamazaki (b. 1916) |
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| tadashi iizuka mayor of Kashiwazaki (b. 1929) |
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tadashi fujiwara Japanese educator |
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tadashi adachi Japanese educator and bureaucrat |
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tadashi fujita Executive Vice President, Japan Airlines |
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| tadashi tsufura victim of the COVID-19 pandemic (1930-2020), US (b. 1930) |
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