An Etymological Dictionary of the German Language/Annotated/Habicht
Habicht, masculine (with a dental suffix as in Hüste and Mond, &c.), ‘hawk,’ from the equivalent Middle High German habich, habech (also hebech, modified), masculine, Old High German habuh, masculine; a common Teutonic term by chance not recorded in Gothic; compare Old Saxon *haƀoc (in the proper names Haƀuchorst, Haƀocasbrôc), Dutch havik, Anglo-Saxon heafoc, English hawk, Old Icelandic haukr (for *hǫƀukr). The Gothic form would be *habaks, with a suffix aks-, as in ahaks, ‘pigeon’ (compare also Kranich, Lerche); compare the consonantal suffix in Greek ὀρτυγ-, ‘quail.’ Against the derivation from the stem hab, haf, in heben, originally, ‘to take firm hold of, lay hold of’ there is nothing to object from the Teutonic point of view; Italic capus, ‘hawk,’ is certainly derived from the root kap (capio). The Keltic cognates, Welsh hebauc, Old Irish sebocc, ‘falcon,’ are undoubtedly borrowed from Teutonic. Compare also Falke.