Cognomen Gretton (Gretton 
) , around the world, is quite a rare family name. The family name Gretton is characteristic of Isle of Man, where it is quite a rare surname, the United Kingdom, and Australia, where it is a rare surname. Measured by absolute frequency, it is commonest in the United Kingdom, Australia, and Kenya. Very seldom, Gretton is the forename as well as the last name.
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| Gretton | Japan, United Kingdom, Australia, Kenya, United States |
| charles gretton English clock and watchmaker (b. 1649) |
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| william gretton Master of Magdalene College, Cambridge, GB (b. 1736) |
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| george gretton 18th-19th century Anglican priest (b. 1754) |
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| john gretton (1793-1867) (b. 1793) |
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| walthall gretton British Royal Navy officer, lieutenant in 1828 (1799-?) (b. 1799) |
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john gretton, 1st baron gretton British politician (1867-1947), GB (b. 1867) |
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mary sturge gretton UK historian and magistrate (1871-1970), GB (b. 1871) |
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| mary gretton (1835-1900) (b. 1835) |
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| john gretton (1836-1899) (b. 1836) |
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peter gretton Royal Navy vice-admiral (1912-1992), GB (b. 1912) |
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| hugh frederick gretton (1869-1928) (b. 1869) |
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| maud helen gretton, lady gretton (died 1934) (b. 1870) |
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| katherine louisa gretton (died 1938) (b. 1870) |
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| r. h. gretton British novelist and historian (1874-1936), GB (b. 1874) |
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| george foster gretton (1878-1950) (b. 1878) |
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