Doesn't anybody remember Frankie Valli and the Four Seasons? They had a huge smash with "Sherry"--and a non-smash with "Connie-O."
And I don't think anybody mentioned the old ballad "Barbara Allen."
Amazing omission: the Beach Boys' "Barbara Ann." (May have been on some of those lists, but I don't count those, they are no fun.)
More recently (and in much darker veins), we should probably count "Jane Says" by (who else?) Jane's Addiction, and "Janie's Got A Gun," by Aerosmith.
Lightening up (and adding a corn- or cheese-factor) there's always "Mame," from the Broadway songbook. (OK, Jerry Herman actually wrote it.)
How about the folk revival era? There was "Good Night, Irene" which, though associated with the Weavers in the 1950s, was created in its current form by Huddie Leadbetter (AKA "Leadbelly"), drawing on folk sources--he credited his uncle Terrell with teaching him an earlier form of the song.