Surname Калниньш (Kalnins 
, Калниньш 
, Kalniņš 
) , around the world, is quite a common family name. The family name Калниньш is habitual in Northern Europe, particularly Latvia, where it is a common surname, Lithuania, where it is quite a rare surname, and Estonia. Measured by absolute frequency, it is commonest in Latvia, the United States, and Germany.
| VARIANT | COUNTRY |
|---|---|
| Kalnins | Australia, Germany, United Kingdom, United States, Latvia |
| Калниньш | Russia, Ukraine |
| Kalniņš | United Kingdom, Estonia, Germany, Latvia |
| калниньш, юрис LV (b. 1847) |
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| отто иванович калниньш LV (b. 1856) |
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| калниньш, арвид иванович Latvian chemist and politician (1894-1981), LV (b. 1894) |
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| калниньш, фридрих карлович LV (b. 1887) |
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| калниньш, альберт петрович BY (b. 1928) |
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| калниньш, андрис LV (b. 1956) |
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| калниньш, гатис Latvian football player, LV (b. 1981) |
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