What does Elpis mean?
The Ancient Greek word for 'hope' and the name of its personified spirit (the Roman equivalent being Spes). Used as an early Christian/Greek given name; the Modern Greek form is Elpida.
What does Nerida mean?
Associated with the Greek Nereids, the sea nymphs who were daughters of the sea-god Nereus, and with Greek neros 'water'. The name itself appears to be a relatively modern coinage (a popular Australian claim of an Aboriginal 'water lily' meaning is poorly documented), so treat the sea-nymph sense as its best-supported reading.