As I have thought – not really any islands with a “U” that are livable or have room for humans except for Utila which has one main road. Great island for expats. Some fun ones to state when I did my research:
Umm Jinni of Bahrain
Upper Grey Cloud in Minnesota
Umbrella in Canada
U Thankt in NY
U Thankt is the only one I can find an actual description of! It’s artificial and only about 100 by 200 feet in size. People can’t even enter it and there is a reef around it which makes fishing possible if you’re on a boat.
That’s pretty much it for U! Let’s see what the next letter brings..