Validates personal names.

Conditions:

1. Must contain only letters (any unicode letter), spaces, apostrophes and hyphens
2. Must not start with a space, an apostrophe or a hyphen
3. Must not contain consecutive uppercase letters
4. Must not contain consecutive spaces
5. Must not contain consecutive apostrophes
6. Must not contain consecutive hyphens
7. Must not contain a space before or after a hyphen
8. Must not contain an apostrophe before or after a hyphen
9. Must not contain enclosing apostrophes ('single quote' style)
10. Must not end with a space or a hyphen
11. Must contain at least one character