Sydney, as in Sydney Carter, is never a woman's name over here that I've neard. Mind you, no name is safe from being appropriated.

I imagine in Canada there must be a lot of confusion about people called Jean. I remember a friends of mind enthsuiing about this booke they had found by this great woman called Jean Vanier. I had to tactfully get aross the message that whiole totally agreeing about Jean Vanier being great as a writer and in other ways, he's a man.

It seems pretty clear that Áine and Enya are two different names.

Áine - (AN-yuh or AW-ne) from Old Irish aine "brilliance, wit, splendor, glory"; "joy", "brightness", "fasting", "praise", or "radiance". In legend, Aine was the daughter of Fer I (Man of the Yew) and the traditional name of the queen of fairies of south Munster, an important and varied role in Celtic mythology; was believed to dwell at the place now called Knockany (Cnoc Aine, "Aine's Hill"). Also used as an Irish form of Aina, Anne.

Eithne - (AY-he-ne or ETH-nuh) "kernel or seed."

And Enya is a version of Eithne.