The Bolt may have been long off but the Spark name was announced in 2009 and started selling at the same time as the Volt. The Spark was available for the 2011 model year in Europe and for the 2013 model year in the U.S (with a BEV option). The Chevy Volt on the other hand was available for the 2011 model year. So they definitely seemed to be going for electricity themed names.