Why do middle names exist?

Related questions

1. What is first name and middle name?
2. Is your surname your last name?
3. What is first name and last name in PAN card?
4. When did people start using last names?
5. What is first name for Chinese?
6. What is first name and last name example?
7. What's the most common first name in the world?
8. Is middle name father's name?
9. Is surname same as last name?
10. What is initial name example?

Tags

1. #decide
2. #surname
3. #given
4. #today
5. #eventually
6. #originated
7. #third
8. #names
9. #baptismal
10. #between
11. #settled
12. #second
13. #middle
14. #saint
15. #children
16. #europeans
17. #family
18. #naming
19. #child
20. #first
21. #their
22. #giving
23. #couldn