This is how the Scottish folk group The Livingstones sang it on The Livingstones In Concert (Waverley SZLP 2105, 1968):

High Dunn

I once was well acquainted with a man called Mr Dunne,
A very jovial man was he and full of coortin' fun.
He very soon was married, and he was twenty one,
And soon a great big family had Mr And Mrs Dunne.

Chorus;
For there was High Dunne, Low Dunne, Over Dunne, Under Dunne,
All the little younger Dunnes it's in and out they'd run,
For there was Young Dunne, Old Dunne, Young Dunne's youngest son,
Young Dunne will be undone when Old Dunne's done.

Well, Young Dunne thought to himself that he would take a wife,
And like his father found it hard to struggle through this life,
To keep six little children full, and a wife weighing twenty ton,
Well, any man that can do that he ought to say well done.

(Chorus)

Well here's good luck to Mr Dunne likewise his youngest son,
We hope the younger Dunnes will do as the older Dunnes have done.
"What's done," says Dunne, "should be well done." and to avoid a Dunne,
"What's done," says Dunne, "can't be undone, so well done good old Dunne!"

(Chorus)