Family name Iorwerth (Iorwerth 
) , across the world, is a very rare surname. The cognomen Iorwerth is characteristic of the United Kingdom, where it is a very rare surname, and the United States, where it is an extremely rare surname. More prevalently, Iorwerth is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Iorwerth | United Kingdom, United States, Canada |
Duarte, Ed, Eddy, Edoardo, Edouard, Eduard, Eduardas, Eduardo, Eduardos, Eduards, Eduardus, Eduart, Edvard, Edvárd, Edward, Eetu, Eide, Odoardo, Yarwood, Édouard, Дуарте, Ед, Едвард, Едвардас, Едварт, Еди, Едоардо, Едуар, Едуард, Едуардас, Едуардо, Едуардус, Ету, Эд, Эдвард, Эдди, Эдоардо, Эдуар, Эдуард, Эдуарда, Эдуардас, Эдуардо, Эдуардс, Эдуарду, Эдуарт, Эйде, אד, אדוארד, דוארטה, إد, إدوارد, إدواردو, إيدي, ادوارد, এডি, ედუარდი, エディ, エド, エドアルド, エドワード, 埃德, 埃迪, 愛德華, 艾德, and 艾迪
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llywelyn ap iorwerth Prince of Gwynedd and de facto Prince of Wales, GB (b. 1173) |
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| gruffydd fychan ap iorwerth Welsh knight and marcher lord (b. 1150) |
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| hywel ap iorwerth Welsh lord of Caerleon (b. 1200) |
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| meurig ab iorwerth (b. 1350) |
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| dylan iorwerth (b. 1957) |
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| hywel ap iorwerth Peerage person ID=432206 |
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| einion sais ap dafydd ab iorwerth Peerage person ID=591105 |
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| llywelyn ap iorwerth Peerage person ID=492594 |
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| gwladus ab iorwerth Peerage person ID=432202 |
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| iorwerth 'ddu' ab iorwerth Peerage person ID=432203 |
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| gwladus ferch iorwerth Peerage person ID=654253 |
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| llywelyn ap iorwerth Peerage person ID=654254 |
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| dafydd ab iorwerth Peerage person ID=432210 |
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| llywelyn ii ap iorwerth Peerage person ID=609928 |
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| hywel goeg ab iorwerth Peerage person ID=432201 |
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