The name Carol is a girl's name of English origin meaning "free man". Carol and is often added to lists like Unique Vintage Names for Girls and discussed in our forums with posts like "Drop your least fav name GIRLS".
From the experts:
A Caroline abbreviation that was wildly popular with Mom's generation...or Grandma's. At one time it was a name for baby girls born at Christmas. because of its association with Christmas carols.
Carol began to get popular at the end of the nineteenth century, but its high point was the late 1930s and 1940s, when it was a Top 10 name, reaching as high as Number 4 in 1941.