Family name Koselj (Koselj 
) , around the globe, is a rare cognomen. The surname Koselj is habitual in Slovenia, where it is quite a rare surname, Croatia, where it is a rare surname, and Germany, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koselj | Slovenia, Brazil, Croatia, Germany |
| stane koselj SI (b. 1910) |
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| anton koselj SI (b. 1932) |
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| jelka koselj SI (b. 1941) |
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| nataša koselj SI (b. 1969) |
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| klemen koselj SI (b. 1974) |
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| vesna koselj SI |
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| mira kajtna-koselj SI |
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| viktor koselj SI |
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| miha koselj SI |
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| samo koselj SI |
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| primož koselj SI |
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| jure koselj SI |
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