Well it's just a funkle kinda morning! Yeah, I've noticed that about Irish music. I'll see a piece mentioned on a CD, think I've never heard it, then when I play it, I realize I know it by a different name. "Star of the County Down" is like that. I knew it first as "Variations on Divas and Lazarus", written by Ralph Vaughn Williams. I know he based HIS version on the folk tune. Only after I heard his version, did I hear the hymn, "I Heard the Voice of Jesus", which is yet another variation on the theme.
There's another hymn to the tune of "Star of the County Down", but I can't remember which it is.
And the tune itself can be played either slowly and mournfully in 3/4 time or in a bouncy 4/4 time...some bands will start with one and jump into the other, which sounds vey cool.