This article is from the Tolkien FAQ, by William D.B. Loos loos@hudce.harvard.edu with numerous contributions by others.
Yes. All humans, East, West, North, or South, were. Humans first
appeared in the east and spread westwards, with some eventually crossing
the Blue Mountains into Beleriand. The entry for Atani in the Silmarillion
index reads:
Atani 'The Second People', Men (singular Atan). Since in Beleriand for
a long time the only Men known to the Noldor and Sindar were those of
the Three Houses of the Elf-friends, this name (in the Sindarin form
Adan, plural Edain) became specially associated with them, so that it
was seldom applied to other Men who came later to Beleriand, or who
were reported to be dwelling beyond the Mountains. But in the speech
of Iluvatar the meaning is 'Men (in general)'.
[Humans were 'the second people' because Elves were the Firstborn.]
 
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