Globally, Ilarion (Илларион 
, Ilarion 
, Иларион 
) is quite a rare masculine first name. The first name Ilarion is characteristic of Georgia, where it is quite a common masculine name, Paraguay, where it is quite a rare masculine name, and Bulgaria. Not in comparison with a country's population, it most frequently occurs in Russia, Georgia, and Kazakhstan. Much less frequently, Ilarion is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Илларион | Kazakhstan, Belarus, Kyrgyzstan, Uzbekistan, Russia |
| Ilarion | Paraguay, Georgia, Democratic Republic of the Congo, Romania, Moldova |
| Иларион | Kazakhstan, Ukraine, Belarus, Bulgaria, Russia |
| ilarion borisovic tolbuzin (b. 1650) |
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| ilarion makaronis TR (b. 1850) |
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ilarion felea RO (b. 1903) |
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| ilarion troit︠s︡kiĭ born 1886; died 1929 (b. 1886) |
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| ilarion dolnyckyj (b. 1900) |
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| ilarion argatu (b. 1913) |
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| ilarion melnikov Ph.D. Duke University 2005 |
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| ilarion jaroševyc’kyj Professor or Rhetoric and Poetics, Poet |
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| ilarion of zograf MK |
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