Full article: http://kiyoshiro-ritsu.tumblr.com/post/131983850804/tree-of-savior-info-post-1-naming-system
A quick summary of the article:
- Tree of Savior uses two names, Character Name and Team Name (a.k.a first name and last name in real life)
- Team Name is unique, so only 1 person can use it.
- Character Name is not unique, so multiple people can use the same name.
- When adding friends or whispering, always use the Team Name only.