Around the world, Izidorius (Izidorius 
) is a very rare male forename. The forename Izidorius is habitual in Northern Europe, particularly Lithuania, where it is quite a rare masculine name.
| VARIANT | COUNTRY |
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| Izidorius | Brazil, Lithuania |
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izidorius tamošaitis Lithuanian philosopher, LT (b. 1889) |
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izidorius girčys Lithuanian photographer (1903-1989), LT (b. 1903) |
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izidorius mockus Lithuanian forest brother, LT (b. 1920) |
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| izidorius pocius LT (b. 1865) |
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| izidorius straukas (b. 1887) |
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| izidorius vasyliūnas Lithuanian violinist, educator, organist, choir conductor (1906-1982), LT (b. 1906) |
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| izidorius kraunaitis (b. 1899) |
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| izidorius kisinas (b. 1904) |
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| izidorius jonaitis (b. 1909) |
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| izidorius šimelionis BY (b. 1919) |
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| izidorius butkevičius (b. 1924) |
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| izidorius šimkus LT (b. 1949) |
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Jurys, Klevečka, Jaksys, Stancuis, Patašius, Paukštys, Guntorius, Tamošaitis, Vaitiekūnas, Markevicius, and Narkevicius