Family name Kallau (Kallau 
) , in the world, is a rare last name. The cognomen Kallau is characteristic of Estonia, where it is quite a rare surname, Indonesia, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. More frequently, Kallau is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kallau | Estonia, India, Nigeria, Indonesia, Germany |
| novalino harold geoffrey kallau researcher (ORCID 0000-0002-9195-0065) |
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