Kestrel

Derivation from the assumed Vulgar Latin *crepicella, *crepitacillum, a diminutive of crepitāculum, from crepitāre ("to crackle") is difficult to explain from a morphological point of view. Instead, possibly from a root *krek-, *krak- ("to crack, rattle, creak, emit a bird cry"), from Middle Dutch crāken ("to creak, crack"), from Old Dutch *krakōn ("to crack, creak, emit a cry"), from Proto-Germanic *krakōną ("to emit a cry, shout"), from Proto-Indo-European *gArg- ("to shout"). Cognate with Old High German krahhōn ("to make a sound, crash"), Old English cracian ("to resound"), Middle French craquer (used of birds, "to emit a repeated cry"). More at creak, crack.