Surname Ильин (Ilin 
, Iline 
, Ильин 
, and others...) , across the world, is a common last name. The family name Ильин is characteristic of Russia, where it is quite a common surname, Belarus, and Estonia (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in Russia, Kazakhstan, and Belarus. Very seldom, Ильин is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ilin | Romania, Serbia, Indonesia, Russia, Algeria |
| Iline | Indonesia, Tunisia, Germany, Algeria, Russia |
| Ильин | Kazakhstan, Belarus, Kyrgyzstan, Azerbaijan, Russia |
| Iljin | Estonia, United States, India, Germany, Russia |
| Ilyin | Belarus, United States, Germany, Lithuania, Russia |
| Il'In | Bulgaria, Belarus, Russia |
| ильин, иван кондратьевич UA (b. 1688) |
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| ильин, андрей RU (b. 1700) |
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| ильин, иван ильич RU (b. 1714) |
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| ильин, дмитрий сергеевич RU (b. 1737) |
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ильин, николай сазонтович Russian religious thinker, LV (b. 1809) |
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| николай иванович ильин RU (b. 1773) |
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алексей афиногенович ильин RU (b. 1834) |
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ильин, алексей алексеевич Russian cartographer (1858-1942), RU (b. 1858) |
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ильин, фёдор николаевич Russian writer (1873-1959), RU (b. 1873) |
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ильин, семён савельевич Russian engineer, margarine industry, RU (b. 1881) |
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ильин, иван александрович Russian philosopher, RU (b. 1883) |
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| ильин дмитрий тимофеевич UA (b. 1849) |
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ильин, николай яковлевич RU (b. 1901) |
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| ильин, александр михайлович Russian archeologist, RU (b. 1870) |
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ильин, илья иванович RU (b. 1910) |
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