I don't know if it's been mentioned before, probably has but, do you think that's something you will change in future? people being able to have the same names? It can be confusing at times, especially when it comes to "Guests" but i don't really see a benefit too it, and alot of time players will copy people's names and cause hassle in chat.
All though to be honest for me it's more to do with multiple guests, sometimes there can be 4 or 5 bordering and it isn't always simple to distinguish who is who by size of force.
It's not a huge deal, i just don't see why it' couldn't be changed in future maybe.
ADDED: As an example, the other evening i bordered 4 Guests, name spelt exactly the same, 2 were in top 10. 2 were not. I couldn't tell which was which from the top 2. Which In my honest opinion, gives them an advantage, be it a minor one at best.