If you click the link in your post you'll find it means 'village of
Elian'.
Elian is a Cornish personal name (also found in Welsh), derived from the elements el- 'much, many' and gan 'born'. Just as in Old English names, element meaning does not greatly affect element combination choices...
Your source is probably confusing
Elian with
Elaine, or some other version of
Helen. :)