Common zinnia: The genus name, Zinnia is also often used as its common name. In fact, the name, Zinnia is given to the plant in memory of the German botanist, Johann Gottfried Zinn. As this plant is the most famous species of the genus and is often cultivated as an ornamental plant, it is called common zinnia.
Youth-and-age: Since the center of the Zinnia appeared as if new flower blooming within an older one, it became popular in Victorian America and referred Zinnia as "youth-and-age."