From Proto-Slavic *bъrzьjь; equivalent to бърз (bǎrz, “fast, swift”) + -ей (-ej).
бъ́рзей • (bǎ́rzej) m
- stretch of a river with swift current, a rapid
- “бързей”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “бързей”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010