Globally, Ieuan (Ieuan 
, איאן 
, 愛恩 
) is a rare male forename. The given name Ieuan is characteristic of the United Kingdom, where it is quite a rare male name, and Australia, where it is a very rare masculine name. Very seldom, Ieuan is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ieuan | Indonesia, United Kingdom, Australia, United States, New Zealand |
| איאן | Israel |
| 叶延, 愛恩 | China |
Džons, Erwann, Evan, Gian, Gianni, Giannis, Giovan, Giovanni, Giuàn, Hannes, Hanns, Hans, Honsa, Honza, Huans, Ian, Ianka, Ifan, Ioan, Ioann, Ioannes, Ioannis, Ion, Ivan, Ivano, Ivans, Ivashka, Ivo, Iván, Iwan, Iwo, Jaan, Jack, Jan, Janka, Janos, Jean, Jehan, Jhoao, Joan, Joannes, Joao, Jogvan, Johan, Johann, Johannes, Johannès, Johano, John, Johnny,
Ieuan is also a prevalent name for the fictitious and mythical characters: Ian Noble , the fictional character based on and portrayed by the Action Man action figure lines and associated media franchise from the American toy-company Hasbro, Inc.; Ian Malcolm , the fictional character in the Jurassic Park books and films; Ian Chesterton , the fictional character, Doctor Who; Ian Mercer , character in Pirates of the Caribbean: Dead Man's Chest and Ian Gallagher , the character on television show Shameless, and in many other works.
| ieuan ap llywelyn ap cynwrig ap hywel ap madog of radyr (1279-1341) (b. 1278) |
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| ieuan llwyd ab y gargam bard and poet (b. 1350) |
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| ieuan wyn (b. 1350) |
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| ieuan ab owain glyndŵr Illegitimate son of welsh prince (b. 1380) |
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| ieuan ap hywel swrdwal Norman-Welsh poet, GB (b. 1430) |
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| ieuan brechfa poet and genealogist, GB (b. 1430) |
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| ieuan ddu ap dafydd ab owain Welsh poet, GB (b. 1440) |
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| ieuan ap llywelyn Peerage person ID=595524 (b. 1445) |
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| ieuan gethin Welsh poet (b. 1450) |
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| ieuan du'r bilwg Welsh poet, GB (b. 1450) |
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| ieuan brydydd hir Welsh writer (b. 1450) |
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| ieuan ap gruffudd leiaf Welsh poet (b. 1450) |
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| ieuan ap huw cae llwyd Welsh minor poet (fl. 1475-1500), GB (b. 1450) |
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| ieuan dyfi Welsh poet (b. 1461) |
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| ieuan vaughan ab ieuan Peerage person ID=595527 (b. 1480) |
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Rees, Turner, Harris, Hughes, Walker, Roberts, Diyaolu, Jenkins, Edwards, Harding, Handley, Francis, Walters, Watkins, Matthews, Phillips, Reynolds, Richards, Jeffreys, Nicholls, Williams, Griffiths, Thomas, George, Davies, Rosser, Rhys, John, Hall, Hood, Owen, Short, Smith, Adams, Bevan, Brown, Llewellyn, Parry, Lewis, Lloyd, James, Jones, Ellis, Evans, Harry, White, Morris, Morgan, Price, and Woodhouse