What does Calliope mean?
From Greek Kalliopē, from kallos 'beauty' + ops 'voice', literally 'beautiful-voiced'. The name of the Muse of epic poetry; the 'beauty' root (kallos) is explicit.
What does Eleni mean?
Modern Greek form of Helen/Helene. The etymology is uncertain: most often linked to Greek 'hele' ('torch') or a root meaning 'shine/bright', with some scholars instead proposing a connection to the moon or a pre-Greek word of unknown meaning. The 'torch/bright light' reading is traditional but not settled.