Family name Kalu (Kalu 
, Kalau 
, كالو 
) , across the world, is a widespread cognomen. The cognomen Kalu is characteristic of Sub-Saharan Africa, particularly Nigeria, where it is quite a common surname, Togo, and Cabo Verde. Not in comparison with a country's population, the name is most common in Nigeria, India, and Pakistan. More prevalently, Kalu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kalu | Kenya, Saudi Arabia, India, Nigeria, Pakistan |
| Kalau | Ethiopia, Kenya, Saudi Arabia, India, Nigeria |
| كالو | Sudan, Saudi Arabia, Syria, Iraq, Egypt |
| Калу | Kyrgyzstan, Russia, Kazakhstan, Ukraine |
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kalu ndukwe kalu Nigerian-born American political scientist, US (b. 1954) |
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uchechi kalu American writer and entrepreneur, US |
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ifeanyi kalu A Nigerian Film Actor , Model, And A Fashion Designer, NG (b. 1988) |
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| kalu idika kalu Nigerian politician, NG (b. 1939) |
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| joseph oboh kalu Nigerian boxer (b. 1940) |
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joshua kalu American football player (born 1995), US (b. 1995) |
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samuel kalu Nigerian association football player, NG (b. 1997) |
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| chinyere kalu first Nigerian female pilot, NG (b. 1970) |
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| joyce kalu Nigerian actress, NG (b. 1970) |
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| joyce kalu Nollywood actress, NG (b. 1970) |
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| n. d. kalu player of American football, US (b. 1975) |
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| maxwell kalu Nigerian footballer, NG (b. 1976) |
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| julius kalu Kenyan bishop |
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| nnanna uzor kalu Nigerian politician |
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| peculiar kalu researcher |
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