After All These Years, Grandma and Grandpa Are Still Going Strong

BabyCenter's most popular nicknames for grandmothers:

1. Grandma
2. Nana
3. Grammy
4. Granny
5. Mimi
6. Gram
7. Nanny
8. Oma
9. Mamaw
10. Gran

Source: Flickr user Suzanne Shahar

BabyCenter's most popular nicknames for grandfathers:

1. Grandpa
2. Papa
3. Granddad
4. Gramps
5. Pop-Pop
6. Poppy
7. Papaw
8. Pop
9. Opa
10. Pappy

Source: Flickr user Marc Levin

Check out grandmother nicknames from around the world from Grandparents.com:

1. African: Henna, Bibi, or Ugogo
2. Armenian: Tatik
3. Australia: Maayy and Momu
4. Cajun: MawMaw
5. Chinese: Zumu or Wai Po
6. Dutch: Grootmoeder 
7. French: Mémé
8. German: Oma
9. Greek: Yaya
10. Hindi: Daadima
11. Hebrew: Savta or Safta
12. Irish: Maimeo or Morai
13. Italian: Nonna
14. Japanese: Obaba
15. Korean: Halmoni
16. Portuguese: Avo
17. Russian: Babushka
18. Spanish: Abuelita 
19. Swedish: MorMor
20. Yiddish: Bubby

Source: Flickr user Philippe Put

Check out grandfather nicknames from around the world from Grandparents.com:

1. African: Babu
2. Armenian: Papik
3. Australia: Waayamaa or Garrimaay
4. Cajun: PawPaw
5. Chinese: YeYe or Wai Gong
6. Dutch: Grootvader 
7. French:  Pépère
8. German: Opa
9. Greek: Pappous
10. Hindi: Daa-daa-jee
11. Hebrew: Saba
12. Irish: Daidoe or Daddo>
13. Italian: Nonno
14. Japanese: Sofu
15. Korean: Halabeoji
16. Portuguese: Avo
17. Russian: Dedushka
18. Spanish: Abuelita 
19. Swedish: Farfar or Morfar
20. Yiddish: Zaide

Source: Flickr user bigbirdz