Family name Mandelj (Mandelj 
) , globally, is a rare surname. The surname Mandelj is characteristic of Slovenia, where it is quite a common surname, New Zealand, where it is a very rare surname, and Argentina. Measured by absolute frequency, it most frequently occurs in Slovenia, the United Kingdom, and Argentina.
| VARIANT | COUNTRY |
|---|---|
| Mandelj | United Kingdom, Brazil, Slovenia, Argentina, New Zealand |
| josip mandelj politician (b. 1865) |
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| tina rahne mandelj SI (b. 1979) |
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| tilen mandelj SI |
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| simon mandelj SI |
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| janez mandelj SI |
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