Should it be mentioned that all the names of members of the Black Order have something to do with the color black or something that is black?
Corvus Glaive - Corvus is the genus name for crows and ravens, which are black
Proxima Midnight - Midnight is the darkest time of night
Black Dwarf - The color black
Ebony Maw - Ebony is a wood that is black in color
Supergiant - Supergiants are stars that leave behind black holes when they die