Further to the issues regarding non-unique region name support in Second Life, I did a bit of research regarding the rather inconsistent implementation of non-unique vs unique region name support in aspects or systems of Second Life that were developed by Linden Lab. List of systems using/supporting modes of region name usage. unique non-unique. the [...]

Personally I’m against it. You generally don’t have (thing) with the same name the same (other thing): street in the same town. town in the same county. county in the same country. country in the same continent. continent in the same planet. planet in the same solar system. domain name in the same network. book [...]