All around the world, Iestyn (Iestyn 
) is a rare masculine given name. The forename Iestyn is habitual in the United Kingdom, where it is a rare masculine name, Australia, where it is a very rare masculine name, and China, where it is an extremely rare male name.
| rhydderch ap iestyn King of Gwent and Morgannwg, GB (b. 950) |
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| iestyn ap gwrgant last independent ruler of Glamorgan, GB (b. 1045) |
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| iestyn rhys williams Welsh official of the National Coal Board, GB (b. 1892) |
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iestyn harris English rugby league footballer and coach, and rugby union footballer, GB (b. 1976) |
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iestyn thomas Welsh rugby union footballer, GB (b. 1976) |
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iestyn Welsh saint |
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| iestyn garlick Welsh actor, producer and television presenter, GB (b. 1952) |
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| iestyn davies British opera singer, GB (b. 1979) |
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| iestyn whitehouse researcher |
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| iestyn michael adams researcher |
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| morgan gam ap morgan ap caradog ab iestyn - Feb 1240/1 |
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| iestyn shapey researcher (ORCID 0000-0003-3300-1053) |
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| iestyn polson English record producer |
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| iestyn evans British puppeteer |
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| iestyn lewis |
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Cale, Ingman, Walton, Mullins, Perkins, Roberts, Jenkins, Edwards, Harries, Howells, Watkins, Matthews, Phillips, Robinson, Rowlands, Richards, Williams, Pettigrew, Pritchard, Griffiths, Llewellyn, Humphreys, Hughes, Henson, Harrod, Harris, Rees, Long, John, Hill, Owen, Smith, Bouzy, Burke, Parry, Dixon, Lewis-Jones, Lewis, James, Jones, Evans, Morris, Morgan, Bright, Bufton, Powell, Davies, Thomas, Lloyd, and Richards-Rees