Surname Tiitus (Tiitus 
) , in all the world, is a rare family name. The cognomen Tiitus is characteristic of Northern Europe, particularly Estonia, where it is quite a common surname, Sweden, where it is a rare surname, and Norway, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Estonia, Sweden, and Brazil. Very seldom, Tiitus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tiitus | Sweden, Indonesia, Estonia, Finland, Brazil |
| mihkel tiitus (b. 1889) |
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| romulus tiitus (b. 1906) |
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| piia tiitus EE (b. 1938) |
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| marko tiitus (b. 1971) |
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