Surname Trinajstić (Trinajstić 
) , all over the world, is a rare family name. The cognomen Trinajstić is habitual in Southern Europe, particularly Croatia, where it is quite a rare surname.
| nenad trinajstić Croatian chemist, HR (b. 1936) |
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| ivo trinajstić botanist, RS (b. 1955) |
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Ela, Marija, Mladen, Sandra, Andrea, Branka, Robert, Dharma, Drinka, Jelena, Silvija, Silvana, Andrija, Biserka, Radovan, Roberta, Danijel, Darinka, Dominik, Jasmina, Tatjana, Nataša, Marino, Zoran, Ivica, Ivana, Iva, Maja, Dean, Tomo, Nina, Neda, Ivan, Igor, Marin, Matej, Marijana, Maša, Boris, Bojan, Bruno, Karlo, Petar, Darko, Damir, Dinko, Nenad, Filip, Arsen, and Katarina