The Blue Crab gets its proper name from Greek and Latin roots which break down to mean, “beautiful-swimmer” and “savory."  I cannot recall ever seeing a crab swim but I do understand the “savory” aspect of the origin of the name.  We put crab meat on just about everything in New Orleans.   

Crabs are bottom-feeders, one of the cleaners of the sea, a noble creature, that gives so much to humanity, and they are so wonderful to observe.