Definitions of merle:

• noun:   common black European thrush
• name:  A male given name (common: 1 in 4761 males; popularity rank in the U.S.: #468)
• name:  A female given name (rare: 1 in 9090 females; popularity rank in the U.S.: #839)
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #18087)