Molly Malone was a very popular ballad throughout many countries, not just Ireland.
I remember singing Molly Malone when I was very little in school here in Australia in the 1960's.
The USA has a lot of people of Irish descent and the Irish immigrants probably sang it and it became popular there too.
In the 1950's when this movie was set, I'm sure that Ellen Hathaway, had she existed, would have learned it as a young girl.
A lot of American movies included Irish melodies and ballads. And remember that General George Custer even adopted an Irish drinking song as the theme for his 7th cavalry.
Maybe all this will help you to understand the choice of that tune.
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