Wow, so many of these names are mysterious to the non-Welsh person.
Elidir sounds romantic.
I love
Iago Elidir.
I reckon the Cornish version of
Iago sounds cool and is usable - i.e.
Jago - and a friend wanted to use it after I suggested it, but it was vetoed. I predict
Jago will be the next "big thing" in boys' names!