Family name Ruff (Ruff 
, راف 
, Руфф 
) , globally, is a common cognomen. The surname Ruff is habitual in Hungary, where it is quite a rare surname, Germany, and Switzerland. In absolute terms, it is commonest in the United States, Germany, and the United Kingdom. Much less frequently, Ruff is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ruff | France, United States, Germany, United Kingdom, Democratic Republic of the Congo |
| راف | Palestinian Territory, Iraq, Saudi Arabia, Egypt |
| Руфф | Kazakhstan, Kyrgyzstan, Ukraine, Belarus, Russia |
| Рафф | Kazakhstan, Russia, Ukraine |
| william ruff English sports journalist (b. 1802) |
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| johannes ruff Swiss painter, draftsman and engraver, CH (b. 1813) |
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otto ruff German chemist, DE (b. 1871) |
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stanisław ruff Polish surgeon, PL (b. 1872) |
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paul charles ruff French politician and journalist, FR (b. 1883) |
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| george ruff (b. 1826) |
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pierre ruff FR (b. 1877) |
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| josef ruff physician in Stuttgart, Germany and Carlsbad, Czechia (ca1846-1912), CZ (b. 1846) |
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| jeanne ruff FR (b. 1840) |
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| hugo ruff DE (b. 1843) |
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siegfried ruff German physician; defendant at the Nuremberg Doctors' Trial (1907-1989), DE (b. 1907) |
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| jules ruff French rabbi and military chaplain, FR (b. 1862) |
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| theodore christian ruff American politician, US (b. 1871) |
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paul ruff FR (b. 1913) |
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david ruff American artist (1925–2007), US (b. 1925) |
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