From Wiktionary, the free dictionary
Feminine form of Proto-Slavic *vorbь m + -ка (-ka).
вра́бка • (vrábka) f (masculine врабе́й or врабе́ц)
- female equivalent of врабе́й (vrabéj), female equivalent of врабе́ц (vrabéc): female sparrow
- “врабка”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “врабка”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010