Why is Jon Snow last name Snow?

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Tags

1. #northlands
2. #naming
3. #bolton
4. #ramsey
5. #their
6. #bastard
7. #bastards
8. #westerosi
9. #brynden
10. #standard
11. #father
12. #became
13. #rivers
14. #riverlands
15. #receive
16. #conventions
17. #legitimized
18. #region
19. #before
20. #surname