What does Basil mean?
From Greek 'basileios', meaning 'kingly, royal', derived from 'basileus' ('king'). Carried by Saint Basil the Great. The sense is the adjective 'royal/kingly' rather than the noun 'king'. (The herb shares the same root.)
What does Perseus mean?
Perseus is the Greek hero who slew Medusa; his name is often linked to “to destroy.”