It's why relative names and forkable registry is a good solution.
But in some cultural context where a registry is mainstream, names are almost unique.
Here are some explanations :
- http://seenthis.net/messages/358071
- https://gnunet.org/sites/default/files/paper_cans2014_camera...
> 3.3 Relative Names for Transitivity of Delegations
> Users can delegate control over a subdomain to another user’s zone by indicating this in a new record