how is the above mentioned second moon related to mythology?
It is named after a group of sea-nymphs of Greek mythology.
Nereid (moon)
It is named after the Nereids, sea-nymphs of Greek mythology and attendants of the god Neptune.
what is the surface of neptune made from Mainly hydrogen and helium, along with water, methane, ammonia, hydrocarbons and nitrogen which planet is it? Neptune when was it discovered? 1846 by whom? Johann Galle can you name any of its moon? Triton, Nereid, Proteus, Thalassa to name a few does it possess any ring? Yes, comprising  ice particles coated with silicates or carbon-based material how is the weather here? Characterised by  extremely dynamic storm systems, with wind speed reaching almost supersonic flow
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Nereid (moon) [SEP] Discovery and naming
Nereid was discovered on 1 May 1949 by Gerard P. Kuiper on photographic plates taken with the 82-inch telescope at the McDonald Observatory. He proposed the name in the report of his discovery. It is named after the Nereids, sea-nymphs of Greek mythology and attendants of the god Neptune. It was the second and last moon of Neptune to be discovered before the arrival of Voyager 2 (not counting a single observation of an occultation by Larissa in 1981).