Throughout the world, Kalff (Kalff 
) is an extremely rare unknown gender first name. Much more prevalently, Kalff is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Kalff | Belgium, Australia, Netherlands, Germany, Indonesia |
| emond barend fremery kalff (b. 1781) |
|
|
|
allard kalff Dutch television presenter and racing driver, NL (b. 1962) |
|