Cognomen Dennes (Dennes 
, 丹尼斯 
) , in all the world, is a rare last name. The last name Dennes is habitual in Australia, where it is a rare surname, Belgium, and Germany. Measured by absolute frequency, it is commonest in Australia, Germany, and the United States. More prevalently, Dennes is the forename as well as the last name.
| george edgar dennes English solicitor and botanist (b. 1817) |
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| eileen dennes Irish actress, IE (b. 1898) |
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| william ray dennes American philosopher (1898-1982), US (b. 1898) |
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| elizabeth ann dennes Peerage person ID=177413 |
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| norman dennes Peerage person ID=177414 |
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