What does Lorenzo mean?
Italian form of Laurence, from the Roman cognomen Laurentius meaning 'man from Laurentum'. The place name Laurentum is itself usually linked to Latin 'laurus', the laurel tree, so the name carries a secondary association with laurel/the victory wreath.
What does Leonardo mean?
Italian form of Leonard, from the Germanic elements 'lewo' (lion, borrowed from Latin 'leo') and 'hard' ('brave, hardy, strong'), giving 'brave as a lion'.