In this thread we (I hope) will come up with instances where essentially the same melody was popular in different times (centuries, decades, etc.) under different titles. For the most part let’s avoid disputed derivative works (e.g., “He’s So Fine”/“My Sweet Lord”) to focus on a popular melody put to new lyrics with renewed popularity.
Other than popular classical tunes used in early Disney animations (which should be a fertile source), I can think of three:
Pete Seeger’s “Wimoweh” became “The Lion Sleeps Tonight” (which was itself popular twice over 30 years apart). (A part of the theme to Wimoweh derives in turn from Solomon Linda’s “Mbube.”)
Kurt Weill’s “Moritat” became “Mack the Knife.”
The Civil War-era ballad “Aura Lee”, later recorded by Jim Reeves and others, gave rise to Elvis’s “Love Me Tender.”
Who has other examples?