European Languages:
* Spanish: Tres
* French: Trois
* German: Drei
* Italian: Tre
* Portuguese: Três
* Russian: Три (Tri)
* Polish: Trzy
* Dutch: Drie
* Swedish: Tre
* Danish: Tre
* Finnish: Kolme
* Hungarian: Három
* Romanian: Trei
* Czech: Tři
* Slovak: Tri
* Greek: Τρία (Tria)
Asian Languages:
* Chinese (Mandarin): 三 (sān)
* Japanese: 三 (san)
* Korean: 셋 (set)
* Hindi: तीन (tīn)
* Arabic: ثلاثة (thalātha)
* Hebrew: שלושה (shlosha)
* Vietnamese: Ba
* Thai: สาม (saam)
Other Languages:
* Latin: Tres
* Esperanto: Tri
* Hawaiian: Ekolu
* Zulu: Thathu
* Swahili: Tatu
* Yoruba: ẹ̀mẹ́ta
* Amharic: ሦስት (sost)
This is just a small sample, and there are many, many more languages out there. If you're interested in learning more, I recommend doing a quick internet search for "how to say three in [language name]."