Ausonius was born Wolfgang Alexander Zaugg in Lidingö, northeast of Stockholm, Sweden. He is the son of a Swiss father and a German mother, both of whom had emigrated to Sweden. He grew up in Vällingby, a working class suburb of Stockholm. According to newspaper reports, he was bullied as a child because of his non-Swedish background, which manifested in him being teased for having very black hair and brown eyes. As an adult, he bleached his hair blonde, used blue contact lenses and legally changed his name. Initially, he changed his name to John Wolfgang Alexander Stannerman, and later to John Wolfgang Alexander Ausonius. He went to the German School in Stockholm, a private school, but dropped out before graduating. He later completed his secondary school education in an adult education programme. Ausonius was accepted into the Royal Institute of Technology, but dropped out after a couple of years of unsuccessful study.