As always, everything one needs to know can be found on the Internet, so I did a little research on the topic.
The term “mermaid” literally translates to Sea-lady (Old-English “mere” meaning sea, and maid—as you may remember from The Twelve Days of Christmas—is a young lady). These mystical half-women/half-fish creatures were often spotted when “Sailing, sailing, o’er the bounding main.” Going back thousands of years, they’ve been incorporated into folklore throughout the world. Christopher Columbus himself reported seeing them when he explored the Caribbean late in the 1400s. (It’s possible he confused a manatee with a mermaid…lord only knows what those sailors drank in those days.) Reports of mermaid sightings continue into the 21st century. (Again, what are those sailors drinking? They need to share!)