Cognomen Ajenjo (Ajenjo 
) , in the world, is a rare family name. The last name Ajenjo is characteristic of Spain, where it is a rare surname, Argentina, where it is a very rare surname, and Chile. Measured by absolute frequency, it is commonest in Spain, France, and Argentina. Likewise, Ajenjo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ajenjo | China, Spain, Chile, Argentina, France |
| luis ajenjo Chilean businessperson, CL (b. 1953) |
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| josé antonio fernández ajenjo (b. 1962) |
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| marc ajenjo (b. 1965) |
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| nuria ajenjo researcher |
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| javier ajenjo Polish footballer, ES |
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