Cognomen Petch (เพชร 
, Petch 
, 佩奇 
) , around the world, is quite a rare surname. The family name Petch is habitual in Isle of Man, where it is quite a rare surname, New Zealand, and the United Kingdom. Not in comparison with a country's population, it is the most numerous in the United Kingdom, Australia, and Canada. More prevalently, Petch is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เพชร | Thailand |
| Petch | Australia, Canada, Thailand, United Kingdom, Democratic Republic of the Congo |
| 佩奇 | China |
| Петч | Russia, Ukraine |
Петш, Печ, ก้อนเพ็ชร์, ลิ่มอนุเพชร, เชื้อเพชร์, เชื้อเพ็ชร์, เพชรมั่นคงเจริญ, and เพ็ชรอำ
| william tatton petch British Royal Navy officer, lieutenant in 1814 (1790-?) (b. 1790) |
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| charles adolphus petch British Royal Navy officer, lieutenant in 1828 (1797-?) (b. 1797) |
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tom petch English mycologist and plant pathologist (1870-1948), GB (b. 1870) |
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| walter henry oliver petch (1871-1942) (b. 1871) |
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| gladys petch Norwegian journalist (1886-1966), GB (b. 1886) |
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| ruth constance petch (1898-1984) (b. 1898) |
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| james alexander petch British historian (1900-85), GB (b. 1900) |
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| jeanette rose petch (1901-1901) (b. 1901) |
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| henry oliver petch (1906-1973) (b. 1906) |
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| jeanette agnes lillian naureen petch (1908-1979) (b. 1908) |
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| louis petch English civil servant (b. 1913) |
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| walter ivan petch (1913-1983) (b. 1913) |
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| loe florence petch (born 1915) (b. 1915) |
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| john petch (born 1917) (b. 1917) |
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| norman james petch materials scientist (1917-1992), GB (b. 1917) |
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