Where does “Bielorusia” come from?

Bielorusia (Ido) 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 “Bielorusia”, 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 Русь →Every word from Russian Белору́ссия →Every word from Italian Bielorussia →