Last name Mislej (Mislej 
) , globally, is a rare surname. The surname Mislej is habitual in Slovenia, where it is quite a common surname, Croatia, where it is a very rare surname, and Argentina. In absolute terms, it is commonest in Slovenia, Argentina, and Italy.
| VARIANT | COUNTRY |
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| Mislej | Croatia, Argentina, Slovenia, Chile, Italy |
| luka mislej Carniolan artist (1658-1727), SI (b. 1658) |
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peter mislej Slovene philosopher, SI (b. 1761) |
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| irene mislej AR (b. 1946) |
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| joško mislej SI |
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| vesna mislej SI |
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Mr, Fanny, Irene, Iztok, Zoran, Martha, Marcel, Mateja, Sandra, Robert, Danila, Gregor, Julien, Flavio, Michael, Alessia, Claudia, Roberto, Daniela, Gonzalo, Ludovic, Nataša, Ester, Jorge, Lucas, Lucia, Ana, Eva, Arne, Coni, Dora, Luis, Joze, Tine, Nina, Erik, Ernesto, Frã, Maria, Marie, Maila, Mitja, Paula, Pablo, Ruben, Dario, Darja, Drago, Ivan, and Sebastjan