They were originally called Rev Black and the Rockin' Vicars, then abbreviated it to the Rockin' Vicars, but to get more gigs or even a chance at a record contract, they changed their name to "Rockin' Vickers".
The original name was "Rev Black and the Rockin' Vicars," which was shortened to "Rockin' Vicars" to gain more gigs or a record deal. They then changed their name to "Rockin' Vickers" for better opportunities.