CAPELLA is derived from the English word "capella", which means "the brightest star in Auriga". Capella is the brightest star closest to the North Pole. The Arab astronomers called the "star the driver" because this star shines high in the northern sky ahead of other stars. CAPELLA comes with a wish of "becoming a 1970s star".
"C" of C² is derived from the initial of the English word "composite", which means like "made up of different parts or materials". "²" of C² is generally the square, in this case means "Coupe". "C²" means "Composite Coupe".