When You Go -- was it written for Celtic woman or first recorded by anyone else

I only know When You Go as having been recorded by Celtic Woman but I want to know.
Was it recorded by anyone else before CW or was it newly written for them to record?

I believe it was written especially for them, like Tír na nÓg, Walk Beside Me and Skylands.

I believe it was written especially for them, like Tír na nÓg, Walk Beside Me and Skylands.

I didn't know Tir na NOg was an original.