Family name Gilliatt (Gilliatt 
) , worldwide, is a rare surname. The surname Gilliatt is habitual in the United Kingdom, where it is a rare surname, New Zealand, and Canada. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Canada. Much less frequently, Gilliatt is the forename as well as the last name.
| william gilliatt Gilliatt, Sir William (1884–1956), obstetrician (b. 1884) |
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| roger gilliatt Gilliatt, Roger William (1922–1991), clinical neurologist (b. 1922) |
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| roger william gilliatt British professor of neurology (b. 1922) |
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| penelope gilliatt British writer (1932-1993), GB (b. 1932) |
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| ellie gilliatt GB |
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| steve gilliatt |
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