All over the world, Kastner (Kastner 
, Кастнер 
, קסטנר 
) is a very rare dominantly masculine, but seldom female first name. The first name Kastner is habitual in Nigeria, where it is a very rare male name, and China, where it is an extremely rare male name. Much more frequently, Kastner is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Kastner | Germany, France, United States, Austria, Czechia |
| Кестнер, Кастнер | Ukraine, Russia, Kazakhstan |
| קסטנר | Israel |
Kastnerová, and Kästner
| lorenz kastner DE (b. 1833) |
|
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| emerich kastner Austrian musicologist, AT (b. 1847) |
|
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| walther kastner Austrian jurist (1902-1994), AT (b. 1902) |
|
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| kas kastner American racing engineer, US (b. 1925) |
|
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| elliott kastner American film producer (1930-2010), US (b. 1930) |
|
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| dillon kastner (born 1970), US (b. 1970) |
|