Elros in Quenya is Elerosse, another example of
sound changing.
Both
the names of Elrond and Elros were made to resemble their mother's
name, Elwing.
The term "-wing" has no apparent meaning that I know of;
it is thought to be influenced by the tongue of Ossiriand.
Elros was the first king of the Dunedain of Numenor,
son of
Earendil,
twin brother of Elrond,
appointed by the Valar.
Elros was a half-elf given the Choice of the
Half-elven because of the
service of his father, Earendil, to the Valar and the Eruhini. Elros
chose to be a Man,
while his twin brother Elrond
chose to be an Elf.
Elros' son, Vardamir,
succeeded him as king of Numenor.
Reference: Return of the
King
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