How did 10cc get their name ?

Answer 1

probably from a crappy moped they were riding at the time

Answer 2

Jonathon King, he signed them up
to his UK Records label in July 1972 and dubbed them 10cc. By his own account, King chose the name after having a dream in which he was standing in front of the Hammersmith Odeon in London where the hoarding read "10cc The Best Band in the World". A widely-repeated claim, disputed by King[3], but confirmed in a 1988 interview by Creme, [4]is that the band name represented a volume of semen that was more than the average amount ejaculated by men, thus emphasising their potency or prowess