Origin: 1300–50; Middle English gerfaucon, jerfacoun < Middle French, Old French, equivalent to ger- (perhaps < Old High German giri greedy) + fauconfalcon; compare Old Norse geirfalki
1209, from O.Fr. gerfauc, probably from Frankish, from P.Gmc. *ger (cf. O.H.G. gir "vulture") + L. falco "hawk." Folk etymology connects it with L. gyrus (see gyre) in reference to "circling" in the air.