In all the world, William Robert (William Robert 
) is a rare male forename. The given name William Robert is habitual in Reunion, where it is quite a common boy's name, Peru, where it is a rare boy's name, and Chile. Very seldom, William Robert is the last name as well as the forename.
| VARIANT | COUNTRY |
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| William Robert | Australia, Peru, Afghanistan, Ecuador, Reunion |
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william robert broughton British naval officer, GB (b. 1762) |
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william robert grove Wlesh judge and Chemist, GB (b. 1811) |
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william robert mends British Royal Navy admiral (1812-1897), GB (b. 1812) |
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william robert woodman co-founder of the Hermetic Order of the Golden Dawn, GB (b. 1828) |
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william robert brooks American astronomer, US (b. 1844) |
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william robert smith United States federal judge (1863-1924), US (b. 1863) |
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william robert colton British artist (1867–1921), FR (b. 1867) |
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william robert daly American actor and film director, US (b. 1871) |
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| william robert ogilvie-grant Scottish ornithologist (1863-1924), GB (b. 1863) |
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| william robert shepherd American cartographer and historian (1871–1934), US (b. 1871) |
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| william robert johnson Bishop of Orange in California, US (b. 1918) |
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Paz, Jones, Evans, Martin, Sturek, Castro, Barron, Gumley, Taylor, Wright, Sanchez, Samples, Bell Ii, Johnson, Harwood, Mc Lellan, Sherriff, Chambers, Bottenberg, Espinoza, Bouladoux, Rodriguez, Lopez, Darby, Rojas, Ramos, Rea, Eap, Rice, Ruiz, Gore, Hain, Hoad, Fish, Wade, Mapes, Dimalanta, Moore, Staff, Styne, Sykes, Smith, Swift, Anson, Clark, Brown, Klein, Perez, Sipsy, and Hollindale