Romance Languages:
* Spanish: abuelo
* Italian: nonno
* French: grand-père
* Portuguese: avô
* Romanian: bunic
Germanic Languages:
* German: Großvater
* Dutch: grootvader
* Swedish: farfar
* Danish: bedstefar
* Norwegian: bestefar
* Icelandic: afi
Slavic Languages:
* Russian: дедушка (dedushka)
* Polish: dziadek
* Czech: dědeček
* Ukrainian: дідусь (didus)
* Bulgarian: дядо (dyado)
Other Languages:
* Chinese (Mandarin): 爷爷 (yéye)
* Japanese: おじいちゃん (ojiichan)
* Korean: 할아버지 (hal-abeoji)
* Hindi: दादा (dada)
* Arabic: جد (jad)
* Hebrew: סבא (saba)
* Vietnamese: ông nội
* Thai: ตา (ta)
* Turkish: dede
This is not an exhaustive list, but it provides a good starting point for exploring how "grandfather" is expressed across the globe.