Etymology
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kestrel (n.)

kind of small falcon, windhover, c. 1600, earlier castrell (15c.), probably from Old French cresserele (13c.), earlier cercelle (Modern French crécelle), a word of obscure origin. Perhaps it is related to French crecerelle "rattle," from Latin crepitacillium "small rattle," diminutive of crepitaculum "noisy bell, rattle," from crepitare "to crackle, rattle;" possibly from the old belief that their noise frightened away other hawks. The unetymological -t- probably developed in French.

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Definitions of kestrel

kestrel (n.)
small North American falcon;
Synonyms: sparrow hawk / American kestrel / Falco sparverius
kestrel (n.)
small Old World falcon that hovers in the air against a wind;
Synonyms: Falco tinnunculus
From wordnet.princeton.edu