A new and distinct cultivar of Chrysanthemum plant named `Yooceanna`, characterized by its uniform and somewhat outwardly spreading plant habit; strong and freely branching growth habit; dark green-colored foliage; uniform flowering response and habit; can be grown as a spray-type or without bud removal; early flowering habit; daisy-type inflorescences with spoon-shaped ray florets; lavender-colored ray florets; and good postproduction longevity with plants maintaining good substance and color for about three weeks in an interior environment.