Cognomen Kellnberger (Kellnberger 
) , around the world, is a rare surname. The family name Kellnberger is characteristic of Germany, where it is a rare surname, and Spain, where it is a very rare surname. Very seldom, Kellnberger is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kellnberger | Germany, Spain |
| josephine kellnberger (born 1896) (b. 1896) |
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| constance kellnberger 1915-1984 (née Grönlund) teacher, translator (b. 1915) |
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| peter kellnberger German writer, DE (b. 1921) |
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| norbert kellnberger German politician (1928-1986), DE (b. 1928) |
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