Throughout the world, Iolyn (Iolyn 
) is a very rare feminine given name. The forename Iolyn is characteristic of South-eastern Asia, particularly Philippines, where it is a very rare girly name.
| VARIANT | COUNTRY |
|---|---|
| Iolyn | United Kingdom, United States, Philippines |
| iolyn foel Peerage person ID=610243 |
|
|
| sir rhys ap maredudd ap tudur ap hywel of plâs iolyn |
|
|
| iolyn ab ieuan ap tegwared ap dafydd of trefednyfed |
|
|
| iolyn ab ieuan ab iorwerth ab adda |
|
|
| iolyn ab iorwerth ap llywelyn ap gruffudd |
|
|
| iolyn ab ieuan gethin ap madog cyffin of llansilin |
|