My Mom sang it to me this way sometime in the 1970s or 1980s:

I'm in love, I'm in love,
With Atilla the Hun,
Atilla the Hun.

We'll burn up a village
And pillage everyone,
I'm in love with Atilla the Hun.

When she sang it, the second "a" in Atilla's name elongated, as was the word "everyone".

She said she had heard it as a little girl, if I recall correctly. Had there been more words to the song she had heard I believe she would have remembered them.