The first version posted by Joe - collected by Cecil Sharp from Lizzie Roberts in 1916 - is the authentic one, and the source for most of the subsequent versions (including Irish ones) from Jean Ritchie onwards. There was a Mudcat discussion a few years ago in which Jean herself revealed that her sister and cousin had learned it from Sharp when he and Maud Karpeles visited their school in 1917.

I don't know about the second version posted by Joe. It's not from Sharp and not as sung by Ritchie (perhaps someone should correct those details?), but it is similar to Nina Simone's As Joe has said, Niles is notorious for having doctored songs.

Sharp and others collected several related songs sharing some of the same floating verses, but with alternative hair colour, etc.