What does Nitya mean?
From Sanskrit nitya (नित्य), 'eternal, perpetual, constant'; also used as an epithet of the Goddess (Durga/Devi). Well established.
What does Ishani mean?
From Sanskrit ishani (ईशानी), 'mistress, ruler', a name of the goddess Parvati, consort of Ishana (Shiva). Well established as a goddess name.