If GM didn't want to use Volt, but wanted the lightening theme, why not "Lightening" or "Lightening Bolt" or "Thunderbolt", or if they wanted a shorter name, "Thor" or "Zeus". "Bolt", when they already have a "Volt", not a good choice imo. If I was the CEO of GM I'd have vetoed that idea. Which maybe is the reason I'm not CEO of GM.
Reminds me, I was invited to a meeting in the marketing department at a tech company a few years ago, and on the bookshelf there they had a Time-Life coffee table book "The Universe and the Solar System", and next to it Edith Hamilton's "Mythology". I was wondering why those books would be there, along with the business and marketing books I'd expect to see; then I remembered their product names, they all came directly from those two books.