Prabhupāda is not a title applicable only to Śrīla A. C. Bhaktivedānta Svāmī Prabhupāda or even to only Śrīla Bhaktisiddhānta Sarasvatī Gosvāmī Prabhupāda.
Uddhava said the gopis were the greatest devotees of Krsna. Similarly, in his adult life, Srila Puri Maharaja carried the message of krsna-bhakti to the world.
Swami Sadananda was the first western adherent to Gaudiya Vaishnava philosophy in the 20th century. He traveled to India and became an initiated disciple of Bhaktisiddhanta Saraswati.