EAD.  Unisex.  Old Saxon and Icelandic.  The same as Old Norse Audr (q.v.), meaning "rich, wealthy."  Some render it allegorically, "happy."  Also see Eed and Ida. (History of Christian Names, Yonge, 1884).

... There was a man named Ead.  He dwelt at Ead-stead over against Upsal, or somewhat lower down, a strange man and wealthy, of mean family, and somewhat testy.  His son's name was Sigrod.  He had two piebald mares which he was fond of... (Origines Islandicae, Vigfusson-Powell, 1905)