Radhavallabha is a Vaishnava denomination which began with the Vaishnava theologian Harivamsa Gosvami. This theology and Harivamsa Gosvami's leadership created the Radhavallabha sect. Radhavallabha Theology emphasizes devotion to Radharani. There is also a famous temple in Vrindaban of the same name. In this temple, there is no deity of Radharani, but a crown has been placed next to Krishna to signify her presence.
It is also a popular name of Krishna, meaning the concort of Radha.