Cognomen Peklaj (Peklaj 
) , in the world, is a rare surname. The cognomen Peklaj is characteristic of Slovenia, where it is quite a common surname, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Peklaj | Slovenia, Germany |
| andreja peklaj Slovene photographer, SI (b. 1948) |
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| marijan peklaj SI (b. 1943) |
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| cirila peklaj SI |
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| eva peklaj SI |
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| abdon peklaj SI |
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| urška fekonja peklaj SI |
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| martina peklaj SI |
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