Cognomen Kljajić (Kljajić 
, Кляич 
) , around the world, is quite a rare last name. The last name Kljajić is habitual in Southern Europe, particularly Croatia, where it is quite a common surname, Serbia, and Montenegro, where it is quite a rare surname. In absolute terms, it is commonest in Southern Europe, particularly Croatia, Serbia, and Bosnia and Herzegovina.
| VARIANT | COUNTRY |
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| Kljajić | Bosnia and Herzegovina, Croatia, Slovenia, Montenegro, Serbia |
| Кляич | Russia |
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filip kljajić Yugoslav Partisan, HR (b. 1913) |
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robertino kljajić Swedish association football player, SE (b. 1990) |
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| goran kljajić writer, BA (b. 1955) |
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| željko kljajić Slovene policeman, SI (b. 1957) |
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| dušan kljajić Serbian footballer, RS (b. 1963) |
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| marko kljajić |
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| miroljub kljajić SI |
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| alen kljajić SI |
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| jovan kljajić Montenegrin basketball player, ME |
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Ana, Kiki, Pejo, Rade, Dino, Lana, Leon, Luna, Luka, Jure, Juro, Tena, Nada, Niko, Nika, Nina, Nora, Neda, Edin, Hana, Vujo, Ines, Kata, Boro, Adna, Adin, Ada, Leo, Lea, Tea, Noa, Ena, Ema, Eva, Iva, Ivo, Ivan, Mara, Maja, Mile, Mira, Sara, Sava, Alen, Anto, Ante, Anja, Amel, Mato, and Igor