Family name Mravljak (Mravljak 
) , around the world, is a rare last name. The cognomen Mravljak is characteristic of Slovenia, where it is quite a common surname, Australia, where it is a very rare surname, and Croatia.
| VARIANT | COUNTRY |
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| Mravljak | Australia, Slovenia, Croatia |
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dušan mravljak SI (b. 1914) |
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| josip mravljak SI (b. 1892) |
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| darinka mravljak Slovene politician, SI (b. 1965) |
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| gvido mravljak SI (b. 1961) |
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| janez mravljak researcher (ORCID 0000-0003-4591-3455) |
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| franc mravljak SI |
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| rok mravljak SI |
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| janez mravljak SI |
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| marija mravljak SI |
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| robert mravljak Slovene police officer, SI |
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