Where does “เบลารุส” come from?

เบลารุส (Thai) comes from English Belarus, from French Biélorussie, from Italian Bielorussia, from Russian Белору́ссия, from Old East Slavic Бѣла Русь — {{w|White Ruthenia}} or White Rus.

Ancestry of “เบลารุส”, step by step

StepLanguageWordMeaning
1EnglishBelarus
2FrenchBiélorussie
3ItalianBielorussia
4RussianБелору́ссияsee usage notes
5Old East SlavicБѣла Русь{{w|White Ruthenia}} or White Rus
Every word from Old East Slavic Бѣла РусьEvery word from Russian Белору́ссияEvery word from Italian Bielorussia