Cognomen Istrefi (Istrefi 
) , in the entire world, is quite a rare surname. The cognomen Istrefi is habitual in Kosovo, where it is quite a common surname, Albania, and North Macedonia, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Albania, Kosovo, and Serbia. Very seldom, Istrefi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Istrefi | Austria, Kosovo, Serbia, Albania, North Macedonia |
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shkumbin istrefi actor, XK (b. 1969) |
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nora istrefi Albanian singer, XK (b. 1986) |
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| fadil istrefi (b. 1933) |
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era istrefi Kosovo-Albanian singer, XK (b. 1994) |
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| gzim istrefi Albanian footballer, SE (b. 1991) |
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| ferat istrefi Albanian tennis player, AL (b. 1991) |
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| arber istrefi FI (b. 1989) |
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