Don't know if these are just an artifact of the human penchant for systematizing by pattern recognition, but the first three I remember was Elvis (8-16-77), Groucho (8-19-77) and Zero (9-8-77). Three of my all-time favorite performers, all good enough to be known by one name.
Zero is dead?!? Until he came along, we counted on our fingers and toes.
j/k Zero Mostel was great, especially in the original "The Producers"