Note that Gainer has the same refrain text, which is said to have been collected "from the singing of William Bush, Index, West Virginia" (no date given), reads as follows:
The Elfin Knight (Child, No. 2)
1. As I walked out in yonder dell, A-hie-a-marukee-mirandy-o, I met a fair damsel, her name it was Nell, Rollickum-bollickum-dandy-o.
The article doesn't mention names but the text was collected by Woofter- Gainer's collecting buddy. I'm not passing judgement because I don't know. If anything Gainer's version may add creedence to Woofters version- tho I think it's also a bit suspicious.
Also there's no source or date given on Gainer's site- not sure why.
I'm still using Woofter's, Gainer's, Comb's, Lomax's and Niles' collected ballads and songs on my site.