P.S. My logical guess would be that the воробей has this rather monstrous reputation because sparrows like to steal seeds that farmers have planted. In contrast, the ласточка ("swallow") has positive associations because it mostly eats insects (including harmful ones), not seeds.
P.P.S. I've been told that real Russian surnames like Воробьёв, Медведев, Тараканов, and so forth, probably derived from nicknames given to some peasant great-great-great-great-grandfather who was humorously called "Sparrow," "Bear," or "Cockroach" by his neighbors. Thus, Воробьёв signifies "descended from a medieval ancestor who was nicknamed 'the sparrow'."
As opposed to purely patronymic surnames like Павлов (originally "son of Pavel"), or occupational surnames like Кузнецов ("the blacksmith's son"), etc.
Говорит Бегемот: "Dear citizens of MR -- please correct my Russian mistakes!"
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