I found a somewhat different version at http://www.ralfweihrauch.de/8.html:

NELLY, THE MILKMAID

Nellie was a milkmaid bonny, brisk and gay,
She always took delight with young Roger for to play.
One day she decided some pleasure for to take
And asked her missus leave for to go to the wake.
Nellie toraloo, Nellie toraloo,
Fair lovely Nelly, to the wake she did go

"Nelly," said her missus, "I'd have you to take care
And of that young Roger I'd have you to beware.
So Nellie, you may go but this promise you must make,
Don't frolic with young Roger coming home from the wake."

So dressed in her best, young Nellie did repair
And as the expected young Roger he was there.
They danced and they sang, they had wine, beer and cake,
And many were the pleasures that they had at the wake.

The day being over, they homeward went their way,
Until they had come to the new cocks of hay.
And Roger kissed young Nell and her promise she did break,
She froliced with young Roger coming home from the wake.

When seven months were over and nine being come,
Young Nellie was the mother of a fine lovely son.
"I will call it," she said, "I will call it for his sake,
I'll call it young Roger coming home from the wake.


....and a recording: http://www.ralfweihrauch.de/resources/Nelly.mp3


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And one more, from http://nostromo.pte.hu/english/rouse/simply/cd/storylyr.html#nellie



NELLIE THE MILKMAID

Nellie was a milkmaid, bonnie, brisk and gay
She always took delight with young Roger for to play
One day she decided some pleasure for to take
And asked her missus' leave for to go to the wake
Nellie tooraloo, Nellie tooraloo
Oh, sweet lovely Nellie to the wake she did go.

"Oh, Nellie," said her missus, "I'll have you to take care
And of that young rogue Roger I'd have you beware
So Nellie you may go but this promise you must make
Don't frolic with young Roger coming home from the wake"
Nellie tooraloo, Nellie tooraloo
Oh, sweet lovely Nellie to the wake she did go.

So dressed in her best young Nellie did repair
And as she expected, young Roger he was there
And they danced and they sang, they had beer, ale and cake
And many were the pleasures that they had at the wake.
Nellie etc.

The day being over, they homeward went their way
Until they'd come to the new cocks of hay
And Roger kissed young Nell and her promise she did break
She frolicked with young Roger coming home from the wake.
Nellie etc.

When seven months were over and nine being gone
Young Nellie was the mother of a fine lovely son
"I will call him," she said, "I will call him for his sake,
I'll call it Young-Roger-Coming-Home-From-The-Wake
Nellie etc.

Both of these versions are very similar to that posted by RTim above.