What does Vaishnavi mean?
From the Sanskrit वैष्णवी (vaiṣṇavī), feminine of Vaishnava, 'relating to Vishnu'. It denotes a female devotee of Vishnu and is also the name of the Shakti (divine energy) of Vishnu, one of the Sapta Matrikas.
What does Nitya mean?
From Sanskrit nitya (नित्य), 'eternal, perpetual, constant'; also used as an epithet of the Goddess (Durga/Devi). Well established.