1. γραψαῖος · grapsaios — Beekes
γραψαῖος [m.] = κάραβος ‘crab’ (Diph. Siph. apud Ath. 3, 106d). «ΡΟ» eETYM Not from γράφω, as per Chantraine RPh. 91 (1965): 211-214. As Frisk states, the origin is unknown; perhaps it is a Mediterranean word. He compared κάραβος (Epich.). Fur.: 123, 154 adduced other forms for ‘beetle’ and ‘crab’: Lat. scarabaeus, which presupposes *oxapaPaioc (note the agreement with our word), σκορόβυλος (from *oxopB-), and … — [Beekes, s.v. γραψαῖος, p. 333]
2. γραψαῖος · grapsaios — Frisk
γραψαῖος = κάραβος, “stacheliger Meerkrebs’ (Diph. Siph. ap. Ath. 3, 106d). — Herkunft unbekannt, vielleicht Mittelmeerwort. Die allgemeine Ähnlichkeit mit ital. (g)ravosta, nhd. Krebs, Krabbe und anderen germ. Wörtern ebenso wie mit κάραβος (8. ἃ.) läßt keine Schlüsse zu. ypdw “‘nagen, fressen’ (Kall. Fr. 200), athem. Ipv. γράσϑι (kypr.), yoä‘ φάγε. Κύπριοι H., präfigiert καγρᾶ" xarapayäs. Σαλαμίνιοι H. (dazu … — [Frisk, s.v. γραψαῖος, p. 358]
3. γραψαῖος · grapsaios — LSJ
crabcrab, Diph.Siph. ap. Ath. 3.106d.