This is a shot in the dark in terms of population without Googling
1. China
2. India
3. U.S.
4. Indonesia
5. Brazil
6. Mexico
7. Germany
8. Russia
9. United Kingdom
10. France
I don’t think that’s right, but maybe close? Pretty confident on the first 5.... wild guesses for the remaining 5.
Edit to add no spoilers ***
Ugh, now I looked it up and there’s a few that were very surprising but others I’m kicking myself for not thinking about.
Edited by Hyroglyphx, : No reason given.