Family name Illig (Illig 
) , all over the world, is quite a rare cognomen. The last name Illig is characteristic of Germany, where it is quite a rare surname, Austria, where it is a rare surname, and the United States. Not in comparison with a country's population, it is commonest in Germany, the United States, and France.
| VARIANT | COUNTRY |
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| Illig | Austria, Germany, Canada, France, United States |
| georg heinrich illig (b. 1709) |
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| moritz friedrich illig German inventor and watchmaker, DE (b. 1777) |
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| johannes wilhelm wendel illig German politician, DE (b. 1806) |
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| blaise illig DE (b. 1851) |
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| johann illig (b. 1865) |
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| udo illig Austrian politician (1897-1989), AT (b. 1897) |
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| lotte illig (b. 1890) |
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| kurt illig DE (b. 1894) |
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| willi illig DE (b. 1897) |
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| josef illig German cinematographer (1908-1970), DE (b. 1908) |
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| franz illig Franz of Salzburg (1908-1991), AT (b. 1908) |
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| ruth illig M.D. (1924-2017) (b. 1924) |
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| rolf illig German actor, DE (b. 1925) |
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| heribert illig German author and publisher, DE (b. 1947) |
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| véronique illig French politician, FR (b. 1962) |
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