I saw on an interview that the name came from a sewing machine that was AC/DC.

"Angus and Malcolm Young claim they developed the idea for the band's name after seeing the acronym "AC/DC" on the back of a sewing machine owned by their sister, Margaret. "AC/DC" is an abbreviation for "alternating current/direct current", which indicates that an electrical device can use either type of power. The brothers felt that this name symbolised the band's raw energy and power-driven performances, and the name stuck."
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"The best argument against democracy is a five-minute conversation with the average voter."
Winston Churchill

"So it goes." Kurt Vonnegut jr.