Why does the royal family not have a surname?

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Tags

1. #prince
2. #direct
3. #styles
4. #surname
5. #incorporating
6. #titled
7. #royal
8. #windsor
9. #usually
10. #since
11. #elizabeth
12. #members
13. #mountbatten
14. #descendants
15. #adopted
16. #titles
17. #philip
18. #sometimes
19. #prescribed
20. #family
21. #senior
22. #although