Cognomen Kajzer (Kajzer 
, Кайзер 
) , throughout the world, is quite a rare family name. The family name Kajzer is habitual in Slovenia, where it is quite a common surname, Kazakhstan, where it is quite a rare surname, and Croatia. In absolute terms, the name is most common in Russia, Kazakhstan, and Poland. Likewise, Kajzer is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kajzer | Germany, Poland, United States, Slovenia, Croatia |
| Кайзер | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| jános kajzer (b. 1807) |
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| rozalia kajzer-piesiur Polish swimmer, PL (b. 1909) |
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| michał kajzer Polish official, diplomat, PL (b. 1921) |
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| janez kajzer writer, journalist, translator, editor, SI (b. 1938) |
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emilia kajzer Polish volleyball player, PL (b. 1992) |
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| leszek jerzy kajzer Polish medievalist, PL (b. 1944) |
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| dušan kajzer Dušan Kajzer architect sex: male, SI (b. 1946) |
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| štefan kajzer SI (b. 1938) |
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| janusz kajzer (b. 1949) |
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| tone kajzer Slovene diplomat and politician, SI (b. 1966) |
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| wojciech kajzer researcher (ORCID 0000-0001-9285-1272) |
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| alenka kajzer SI |
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| marcel kajzer Polish speedway rider, PL (b. 1990) |
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| igo kajzer SI |
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| rafael kajzer SI |
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