Compare Aromanian bardzu ‘white’: both it can the Romanian word may derive from Albanian bardhë (“white”). Alternatively, the Romanian word may derive from a pre-Roman (Balkans) substrate, possibly from or via Dacian, from Proto-Indo-European *bhereg- (“white”). The Romanian word is akin to Albanian bardhë, and possibly derived/borrowed from it. The stork is called "white" also in the Slavic languages: compare Croatian labud.
Another theory, though somewhat unlikely, suggests that its origin is a Latin root *gardea, from ardea. (compare Spanish garza, Portuguese garça, also French barge). The confusion of g and b is somewhat unusual, but may be explained as a Balkan influence. Other cases in Romanian include limbă, rug, negură, întreba (compare also Sardinian bula, from Latin gula) .