Cognomen Cadwaladr (Cadwaladr 
) , throughout the world, is a very rare last name. The last name Cadwaladr is characteristic of the United Kingdom, where it is a rare surname, Canada, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Very seldom, Cadwaladr is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cadwaladr | Brazil, Canada, United Kingdom, United States |
Cadwalader, and Cadwallader
| cadfan ap cadwaladr Prince of Gwynedd (b. 1140) |
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| cadwaladr ap gruffydd King of Gwynedd (b. 1200) |
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| cadwaladr cesail Welsh poet, GB (b. 1614) |
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| rhys cadwaladr Welsh poet and academic, GB (b. 1666) |
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betsi cadwaladr Welsh nurse, GB (b. 1789) |
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| dafydd cadwaladr Welsh Calvinistic Methodist preacher, GB (b. 1752) |
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| siôn cadwaladr Poet from Meirionnydd, GB (b. 1800) |
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llewellyn cadwaladr Welsh opera singer, GB (b. 1857) |
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cadwaladr roberts GB (b. 1854) |
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| cadwaladr tawelfryn thomas Welsh congregational minister (1856–1939) (b. 1856) |
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| dilys cadwaladr Welsh poet, GB (b. 1902) |
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| george cadwaladr British jockey, GB (b. 1945) |
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| cadwaladr wynne of Voelas |
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| rhys wyn ap cadwaladr Welsh poet, GB |
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| cadwaladr roberts Welsh poet |
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