Definitions of viola:

• noun:   a bowed stringed instrument slightly larger than a violin, tuned a fifth lower
• noun:   large genus of flowering herbs of temperate regions
• noun:   any of the numerous plants of the genus Viola
• name:  A female given name (common: 1 in 1162 females; popularity rank in the U.S.: #244)
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5014)