Dataw Island on Datha Island

In response to an article about Northern Datha Island, a resident who has lived here thirty years (!) commented, “I have always questioned why ALCOA did not call the Island by its real name: Datha?”
Researching this question took me on a fascinating journey from a Muskogean Indian Chief to the King of Spain to the U.S. Board on Geographic Names. In the end, I can provide this answer; Dataw Island is the name of our development on a sea island in South Carolina called Datha Island. 

What’s left for this journey is to explain why our sea island is called Datha Island and why our development is called Dataw Island.