Johnny Uno was a famous Jazz singer before the Great War.
Before the bombs fell, Johnny Uno was a well-known Jazz singer who sang at casinos with his band. Little is known of Johnny Uno, but it is apparent that he was very popular due to the number of promotional posters found around the Wasteland. On one occasion, he worked with fellow singer Rosemary "Hot Mama" Horton. His fate after the bombs dropped is unknown, though he was most likely killed in the blast.
Johnny Uno is mentioned only in Fallout: New Vegas.