oh ...no we are not sisters.
my username translates into :
air-head 
well skysidhe sounds better than airhead...but yes a
spirit of the air. *sigh* j/k ( joke)
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a sidhe is a fairy. A fairy is small, benign unless annoyed and dosn't age very quickly. What say you Lady Sidhe?
... I found some more information from the links you posted.
Fairies or sidhe in folk beliefs.
http://en.wikipedia.org/wiki/Fairy