Please remember that the Welsh alphabet does not have a letter "J"...
Welsh Name English Translation
Iago James
Ianto Evan
Iau Jupiter, Jove
Iesu Grist Jesus Christ
Ieuan Evan
Ifan Evan
Ioan John
Iolo (no equivalent)
Iorwerth (no equivalent)
Iwan Evan
Lawnslot Launcelot
Lefi Levi
Leisa Elizabeth
Lisbeth Elizabeth
Lleucu Lucy
Lludd Lud
Llwyd Lloyd
Llyr Lear
Llywelyn Lewis
Lowri Laura
Luc Luke
Lug Luke