Now universally taken as a pet form of Jennifer. In fact, this name existed during the Middle Ages as a pet form of Jean. It is often used independently. Among many well-known bearers are the Swedish soprano Jenny Lind (originally Johanna Lind, 1820–87), the British racehorse trainer Jenny Pitman (b. 1946), and the British actress Jenny Agutter (b. 1952).
Spanish, Catalan, and Jewish (Sephardic): habitational name from any of numerous places called Aguilar, from Latin aquilare ‘haunt of eagles’ (a derivative of aquila ‘eagle’), for example Aguilar de Campo in Palencia, Aguilar de la Frontera in Córdoba, and Aguilar de Segarra in Catalonia.