Cognomen Širca (Širca 
) , in all the world, is a rare last name. The surname Širca is habitual in Southern Europe, particularly Slovenia, where it is quite a rare surname, and Croatia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Širca | Slovenia, Croatia |
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josip širca SI (b. 1854) |
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| marijan širca SI (b. 1854) |
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| franc širca SI (b. 1922) |
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| anton širca SI (b. 1925) |
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| nada trunk širca SI (b. 1957) |
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| simon širca Slovene physicist, SI (b. 1969) |
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| mirjana širca SI (b. 1967) |
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| špela jezernik širca SI |
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| božena šepec-širca SI |
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| judita fedija širca SI |
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| andrej širca SI |
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| saša širca SI |
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| alen albin širca SI |
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| zdenko širca SI |
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