Surname Käo (Käo 
) , all over the world, is a very rare cognomen. The family name Käo is characteristic of Estonia, where it is quite a rare surname, and Germany, where it is an extremely rare surname.
| rudolf käo (b. 1902) |
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jüri käo Estonian businessman, EE (b. 1965) |
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| vladimir käo (b. 1924) |
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| tõnis käo Estonian designer and photographer, DE (b. 1940) |
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| aleksander käo EE (b. 1964) |
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| indrek käo Estonian sport personnel, EE |
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| kristo käo Estonian guitarist, EE (b. 1980) |
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