Surname Cadwgan (Cadwgan 
) , all over the world, is a very rare last name. The last name Cadwgan is habitual in the United Kingdom, where it is a very rare surname, Australia, and Canada, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in the United Kingdom, the United States, and Australia. Much less frequently, Cadwgan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cadwgan | Australia, United States, Canada, United Kingdom |
| cadwgan ap bleddyn Prince of Powys, GB (b. 1051) |
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| owain ap cadwgan Welsh prince of Powys (b. 1085) |
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| cadwgan of llandyfai Welsh cleric, Bishop of Bangor, GB (b. 1150) |
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| cadwgan delynor Welsh musician, GB (b. 1400) |
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| cadwgan ab owain King of Gwent |
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| ieuaf ap cadwgan Peerage person ID=295448 |
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| hoedlyw ap cadwgan Peerage person ID=295447 |
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| llywelyn ap cadwgan Peerage person ID=197799 |
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| thomas cadwgan Peerage person ID=197850 |
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| william cadwgan Peerage person ID=197853 |
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| jill cadwgan researcher |
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| cadwgan ab elystan Peerage person ID=197800 |
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| madog ap llywelyn ap gruffudd ap cadwgan Est 1280 - 1331 |
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| goronwy ap cadwgan Peerage person ID=295446 |
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| william cadwgan Peerage person ID=197847 |
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