sparrowhawk (n.)

small brownish-gray bird (Passer domesticus), Old English spearwa, from Proto-Germanic *sparwan (source also of Old Norse spörr, Old High German sparo, German Sperling, Gothic sparwa), from PIE *spor-wo-, from root *sper- (3), forming names of small birds (source also of Cornish frau "crow;" Old Prussian spurglis "sparrow;" Greek spergoulos "small field bird," psar "starling"). In use, with qualifying words, of many small, sparrow-like birds. Sparrowfarts (1886) was Cheshire slang for "very early morning."

c. 1300, hauk, earlier havek (c. 1200), from Old English hafoc (West Saxon), heafuc (Mercian), heafoc, "hawk," from Proto-Germanic *habukaz (source also of Old Norse haukr, Old Saxon habuc, Middle Dutch havik, Old High German habuh, German Habicht "hawk"), from PIE root *kap- "to grasp" (source also of Russian kobec "a kind of falcon"). Transferred sense of "militarist" attested from 1956, probably based on its opposite, dove.