Last name Au (Au 
, 奥 , アウ 
) , all over the world, is a widespread cognomen. The cognomen Au is habitual in Hong Kong, where it is a common surname, Bermuda, and British Virgin Islands (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in China, Hong Kong, and India. Also, Au is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Au | Hong Kong, Myanmar, Taiwan, Malaysia, China |
| 奥 | China |
| アウ | Japan |
| Ау | Ukraine, Kazakhstan, Russia, Armenia, China |
Ao, Aua, Aue, Avama, Avis, Aw, Awi, Aù, Aú, Aû, Aū, Aű, Aʊ, Goh, Khu, Ng, Ngô, O, Oe, Oh, Ooch, Ou, Ouga, Ouh, Ow, Sau, Woo, Wu, Wú, Àu, Àù, Àû, Áu, Áú, Áű, Âu, Âù, Âû, Âű, Ãu, Ãù, Ãú, Ãû, Ãŭ, Ãű, É, Öbe, Āū, Āｕ, Ăù, Ō, Ōu, Ǎǚ, Ин, Нг, О, Оу, Ын, או, וו, أوه, اوه, وو, ঔ, อ, အု, အု္, အု်, အ့္ု, အ္ု, ဪ, Ấu, Ầu, Ẩu, Ậu, Ẵu, アゥ, アオ, ウー, オ, オウ, ㄠ, 区, 區, 區姓, 吳, 吴, 吴氏, 呉, 奧, 欧, 歐, 殴, 阿乌, 오, Ａu, and Ａū
| franz beer von au Austrian architect, AT (b. 1659) |
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| andreas meinrad von au German painter (1712-1792), DE (b. 1712) |
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adam von au German politician, DE (b. 1869) |
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| au fung-chi Hong Kong church leader (b. 1847) |
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| au alajos HU (b. 1837) |
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| juliusz au PL (b. 1842) |
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| peter von der au DE (b. 1866) |
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| hans von der au German theologian, DE (b. 1892) |
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| alfred au Association footballer (1898-1986), DE (b. 1898) |
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| josephine au Canadian journalist (b. 1901) |
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| au chi yin Hong Kong footballer, CA (b. 1901) |
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albert au Hong Kong singer (b. 1955) |
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| jacob au (b. 1897) |
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| ottomar in der au (b. 1897) |
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| karl schneider-manns au AT (b. 1897) |
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