ABBA
By 1970, they were known as "Bjorn & Benny (With Svenska Flicka)".  Later they were called Bjorn & Benny, Agnetha & Frida. Their first hit was a song called "Hej, gamle man".  By 1971, Bjorn and Agnetha were married and Benny and Frida were engaged. It wasn't until 1973 that the group became officially known as ABBA. The name was suggested by their manager, Stig Anderson.