There are multiple origins and meanings for the name Evelyn:
1. Form of the French name (Aveline), comes from the Latin name (Abellana), meaning - "filbert, hazelnut"
2. Old English "beautiful bird, desired, wanted; hazelnut"
3. Feminine form of the personal name Abel - "breath (of mouth); breathing; steam; father".
4. Hebrew name, form of the personal name Eve (אוולין) meaning - "vital power"