Day-

1. Moonshine
2. Moonlight
3. Darktalons
4. Solar
5. Moonseeker
6. Thoughtkeeper
7. Moondestroyer
8. Starlight
9. Darkstar
10. Void
11. Shadow
12. Revenge
13. Destroyer
14. Sparrow
15. Raven
16. Clearseer
17. Cleardreamer
18. Battleseeker
19. Fearhunter
20. Darkseer
21. Preykiller
22. Cleverkiller
23. Thoughtseer
24. Darkmind
25. Starwind
26. Deadlystar
27. Killertalons
28. Throatsliter
29. Preycatcher
30. Starmind
31. Fearstalker

Or you can do this...

Day- (prefix)

1. Dark-
2. Bone-
3. Vile-
4. Star-
5. Fear-
6. Void-
7. Moon-
8. Clever-
9. Killer-
10. Mind-
11. Clear-
12. Soot-
13. Prey-
14. Shadow-
15. Quick-
16. Silent-
17. Strong-
18. Swift-
19. Secret-
20. Fierce-
21. Sharp-
22. Truth-
23. Sly-
24. Deadly-
25. Lost-
26. Silver-
27. Shade-
28. Space-
29. Fate-
30. Peace-
31. Death-

What your year ends in- (suffix)

1. -Seer
2. -Talons (or Claws)
3. -Eyes
4. -Mind
5. -Strike
6. -Hunter
7. -Watcher
8. -Chaser
9. -Wings
0. -Keeper