Cognomen Otoo (Otoo 
, オトオ , Отоо) , worldwide, is a common surname. The cognomen Otoo is characteristic of Ghana, where it is a common surname, Aland Islands, where it is quite a common surname, and Qatar, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Ghana, the United States, and the United Kingdom. Much less frequently, Otoo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Otoo | Japan, Ghana, United States, United Kingdom, Uganda |
| オトオ | Japan |
| samuel kofi otoo Ghanaian politician, GH (b. 1903) |
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sharon dodua otoo British writer, opinion journalist and activist, GB (b. 1972) |
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| eric kwamina otoo Ghanaian diplomat, GH (b. 1930) |
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bridget otoo Ghanaian journalist, GH (b. 1983) |
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mahatma otoo Ghanaian footballer, GH (b. 1992) |
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| ayikoi otoo politician, GH |
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| john otoo anglican bishop in Ghana |
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| marianne n otoo researcher |
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| barnabas otoo researcher |
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| larry otoo Ghanaian painter, GH |
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| gloria otoo member or fellow of the New York Academy of Medicine |
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| emmanuel otoo researcher (ORCID 0000-0003-0039-2166) |
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| prince otoo Finnish association football player, FI (b. 1985) |
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| gloria e. otoo |
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| margaret otoo Ghanaian association football player, GH (b. 1993) |
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