Romance Languages:
* Spanish: marrón
* Portuguese: marrom
* French: brun
* Italian: marrone
* Romanian: maro
Germanic Languages:
* German: braun
* Dutch: bruin
* Swedish: brun
* Norwegian: brun
* Danish: brun
* Icelandic: brúnn
Slavic Languages:
* Russian: коричневый (korichnevyy)
* Polish: brązowy
* Czech: hnědý
* Ukrainian: коричневий (korichnevyy)
* Serbian: браон (braon)
Other Languages:
* Arabic: بني (buni)
* Chinese (Mandarin): 棕色 (zōngsè)
* Japanese: 茶色 (chairo)
* Korean: 갈색 (galsek)
* Hindi: भूरा (bhura)
* Turkish: kahverengi
This is just a small sampling, and there are many other languages with their own unique words for brown.