Apparently, the name Eyafjöll (which is used in the article with the ö changed to oe) refers to part of the site of the famous Icelandic volcano. From Wikipedia

Apparently, the name Eyafjöll (which is used in the article with the ö changed to oe) refers to part of the site of the famous Icelandic volcano. From Wikipedia: "The name Eyjafjöll describes the southern side of the volcanic massif together with the small mountains which form the foot of the volcano".