Across the world, William Harold (William Harold 
) is a very rare boy's given name. The first name William Harold is habitual in Chile, where it is a very rare male name, Peru, and the United Kingdom. Very seldom, William Harold is the last name as well as the forename.
| VARIANT | COUNTRY |
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| William Harold | United Kingdom, Australia, Chile, United States, Peru |
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william harold malkin Canadian mayor (1868-1959), CA (b. 1868) |
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william harold clark Canadian politician, CA (b. 1869) |
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william harold hutchinson British trade unionist and Labour Party activist (b. 1877) |
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william harold coltman English recipient of the Victoria Cross, GB (b. 1891) |
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| william harold bodine, sr. American politician, US (b. 1874) |
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william harold albritton iii American lawyer, Senior United States District Judge of the United States District Court for the Middle District of Alabama, US (b. 1936) |
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| william harold baker (1887-1962) swimmer (b. 1887) |
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| william harold dudley British landscape painter cartographer, GB (b. 1890) |
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| william harold hutt English economist, GB (b. 1899) |
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| william harold cox United States federal judge, US (b. 1901) |
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| william harold lambert British military officer, GB (b. 1905) |
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| william harold s. bunce British painter (1920-1995), GB (b. 1920) |
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| william harold collins American gridiron football player (1922-1996), US (b. 1922) |
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