Zeal.
"Ellen approached her volunteer work with immense zeal, dedicating every spare moment to helping the community."
A female given name from Ancient Greek.
"Ellen is a classic female given name derived from the Ancient Greek word for light."
The name Ellen comes from the Old English word ellen, which originally meant zeal, strength, or courage. It traveled into modern usage as a personal name derived from these powerful qualities rather than retaining its literal definition of vigor.