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Janis Rainis went by Janis Rainis.
Janis Ian and Janis Joplin were singers in the 70's named Janis. Janis Siegel was also a singer in the 70's.
Janis Rainis's birth name is Janis Plieksans.
Janis Joplin's birth name is Joplin, Janis Lyn.
Byron Janis's birth name is Byron Yankelevitch Janis.