Last name Данаилов (Danailov 
, Данаилов 
, Danailow) , globally, is quite a rare family name. The cognomen Данаилов is habitual in Bulgaria, where it is quite a common surname, North Macedonia, where it is quite a rare surname, and Albania, where it is a rare surname. Measured by absolute frequency, it is commonest in Bulgaria, Spain, and North Macedonia. Much less frequently, Данаилов is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Danailov | Greece, Romania, North Macedonia, Spain, Bulgaria |
| Данаилов | Russia, Bulgaria |
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драган данаилов Bulgarian painter (1873-1948), BG (b. 1873) |
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никола данаилов BG (b. 1877) |
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| христо данаилов bulgarian revolutionary, BG (b. 1850) |
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дафко данаилов MK (b. 1896) |
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| георги данаилов BG (b. 1872) |
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георги данаилов Bulgarian screenwriter (1936-2017), BG (b. 1936) |
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стефан данаилов Bulgarian actor (1942-2019), BG (b. 1942) |
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| ламби данаилов Bulgarian educator and military, BG (b. 1905) |
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енчо данаилов Bulgarian actor, BG (b. 1957) |
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силвио данаилов Bulgarian chess player, BG (b. 1961) |
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| димитър данаилов Bulgarian writer (1921-1992), BG (b. 1921) |
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васил данаилов Bulgarian revolutionary, BG |
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