Surname Hayday (海迪 
, Hayday 
) , all around the world, is quite a rare last name. The cognomen Hayday is habitual in the United Kingdom, where it is a rare surname, Saudi Arabia, and Switzerland. In absolute terms, it is the most numerous in China, the United Kingdom, and Indonesia. More frequently, Hayday is the forename as well as the last name.
| james hayday British bookbinder (b. 1796) |
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| arthur hayday Labour politician (1869-1956), GB (b. 1869) |
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adrian clive hayday British immunologist, GB (b. 1956) |
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| frederick hayday British trade unionist (1912-1990) (b. 1912) |
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| anthony hayday British diplomat (-1930). Deputy High Commissioner, Calcutta, India 1981-1985, Consul-General, Cleveland 1985-1987, Ambassador to Madagascar 1987-1990 (b. 1930) |
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| thomas s hayday researcher |
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| andria hayday American game designer, US |
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| matthew hayday (b. 1977) |
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