The "middle finger" and "ring finger" are not too hard to remember. The "middle finger" is in the middle of all the fingers and the "ring finger" is the finger that we put our big diamond wedding ring on! But do you know the meaning of "thumb," "index finger," and "pinky?"
The "thumb" comes from the Old English word, tûmon meaning "thick." As you can tell, the "thumb" is the thickest finger of all.
The "index finger" comes from the word "index" which means "point (noun)." We usually use this finger to point at something. So the "index finger" is also sometimes called the "pointer finger."
The smallest finger is called "pinky" because it comes from the Dutch word "pink" for little finger. It doesn't have anything to do with the color pink!
English is so interesting, isn't it?