Last name Jarni (Jarni 
) , across the world, is quite a rare cognomen. The surname Jarni is characteristic of Croatia, where it is quite a rare surname, Slovenia, and Malaysia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Indonesia, Malaysia, and Croatia. Likewise, Jarni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Jarni | Malaysia, India, Indonesia, Democratic Republic of the Congo, Croatia |
| robert jarni Croatian footballer and manager, HR (b. 1968) |
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| gašper jarni SI (b. 1979) |
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| kristjan jarni SI |
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| klara jarni SI |
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