Via Blondie's Facebook page:
41 years ago on this day October 12th, 1974... The band consisting of Debbie, Chris, Fred Smith, & Billy O’Connor, (known in Aug 1974 as Angel And The Snake) renamed itself “Blondie” and performed at CBGB. See this SoHo Weekly advert. This is the earliest publication advertising the band by their BLONDIE name.
Speaking of which, Deb looked incredible performing at amfAR Milano 2015!