Feminine form of William, from Germanic 'wil' (will, desire) + 'helm' (helmet, protection).
Willa is generally understood as the feminine form of William, a Germanic name built from elements meaning "will, desire" and "helmet, protection." In that sense, Willa carries the idea of a resolute protector or one whose will is strong. It also overlaps in feeling with other old Germanic names beginning in Wil-, a name element associated with purpose and determination.
Though simple and graceful in sound, Willa has deep medieval roots through the enormous historical reach of William after the Norman Conquest. One of the name's most distinguished bearers is the American novelist Willa Cather, whose work made the name intellectually vivid and artistically serious. Through her, Willa became associated with literary independence, the American landscape, and a kind of austere elegance.
The name has also appeared in fiction and film often enough to retain a romantic, thoughtful aura, neither overly ornate nor plain. Unlike some vintage revivals, Willa never feels purely antique; it has always had a quietly modern line to it. Its usage has evolved from a relatively rare feminine derivative into a warmly revived classic, especially as shorter vintage girls' names returned to favor.
Today Willa fits comfortably beside names like Clara, Stella, and Nora, but has a slightly more bookish and woodsy character. It feels traditional without being rigid, and feminine without frill. Cultural associations with willpower, literature, and frontier independence give the name unusual depth. Willa is one of those names whose softness is balanced by inner steel, which may be why it resonates so strongly in the present day.