Cognomen Ladau (Ladau 
) , throughout the world, is a rare last name. The surname Ladau is characteristic of Finland, where it is a rare surname, Romania, and Malaysia. In absolute terms, it most frequently occurs in India, Malaysia, and Finland. Likewise, Ladau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ladau | Romania, Malaysia, Finland, Nigeria, India |
| otto reinhold ladau (b. 1683) |
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gustaf wilhelm ladau Finnish politician, FI (b. 1765) |
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| johan fredrik ladau Swedish priest, illustrator and botanist (1769–1824) (b. 1773) |
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| karl-erik ladau FI (b. 1916) |
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| joshua ladau researcher |
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| karl otto reinhold ladau |
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| georg kasimir ladau |
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