- IEUAN DAFYDD ab OWAIN - see IEUAN DDU ap DAFYDD ab OWAIN
- IEUAN DAFYDD DDU - see IEUAN DDU ap DAFYDD ab OWAIN
- IEUAN DDU - see HARRIS, JOHN RYLAND
- IEUAN DDU - see THOMAS, JOHN
- IEUAN DDU ap DAFYDD ab OWAIN (fl. c. 1440-1480), poet
- IEUAN DEULWYN (fl. c. 1460), poet
- IEUAN DRWCH Y DARAN (fl. c. 1370-1400?), poet
- IEUAN DU'R BILWG (fl. c. 1470), poet
- IEUAN DYFI (1461? - 1500), poet
- IEUAN (IFAN) DYLYNIWR (fl. 1520-1567), harpist and bard
- IEUAN EBBLIG - see GRIFFITHS, EVAN
- IEUAN FARDD - see EVANS, EVAN
- IEUAN FARDD DDU - see THOMAS, EVAN
- IEUAN FYCHAN ap IEUAN ab ADDA (d. c. 1458), poet
- IEUAN GETHIN ap IEUAN ap LLEISION (fl. c. 1450) Baglan, poet and gentleman
- IEUAN GLAN ALARCH - see MILLS, JOHN
- IEUAN GLAN GEIRIONYDD - see EVANS, EVAN
- IEUAN GWYLLT - see ROBERTS, JOHN
- IEUAN GWYNEDD - see JONES, EVAN
- IEUAN GYFANNEDD (fl. 1450-60), poet
- IEUAN LLAFAR (fl. c. 1594-1610), poet
- IEUAN LLAWDDEN - see LLAWDDEN
- IEUAN LLEYN - see PRITCHARD, EVAN
- IEUAN LLWYD ab Y GARGAM (fl. 14th century), poet
- IEUAN LLWYD BRYDYDD (fl. c. 1460-1490), poet
- IEUAN LLWYD SIEFFRAI (fl. c. 1599-1619), poet
- IEUAN MON (fl. c. 1460-1480), poet
- IEUAN MON HEN - see IEUAN MON
- IEUAN MYFYR - see DAVIES, EVAN
- IEUAN MYNYW - see EVANS, JOHN YOUNG
- IEUAN (IFAN) o GARNO (Syr) (fl. c. 1530-1570), poet and cleric
- IEUAN o LEYN - see HUGHES, JOHN HENRY
- IEUAN RHAEADR, poet
- IEUAN RUDD (fl. 1470), a Glamorgan bard
- IEUAN TEW
- IEUAN TUDUR OWEN (fl. c. 1627), poet
- IFAN ap SION - see IEUAN ap SION
- IFAN DYLYNIWR - see IEUAN DYLYNIWR
- IFAN o GARNO - see IEUAN o GARNO
- IFAN TOMOS RHYS - see THOMAS, EVAN
- IFANDER - see GRIFFITHS, WILLIAM
- IFANS, ROBERT - see ROBERT ab IFAN
- IFOR ap CADIFOR - see IFOR BACH
- IFOR ap LLYWELYN - see IFOR HAEL
- IFOR BACH (fl. 1158), lord of Senghenydd
- IFOR CERI - see JENKINS, JOHN
- IFOR CWMGWYS - see THOMAS, JOHN
- IFOR HAEL, patron of bards
- IFOR MEURIG - see IFOR BACH
- ILES, ANN SOPHIA MARIA (d. 1832), heiress - see LLOYD