The bobby pin got its name in the 1930s, but the inexpensive little wire gadget had become popular with flappers during the “Roaring 20s.”
A short haircut for young women came in vogue for the first time in history, and the bobby pin helped keep its shape.
The bob in “bobby pins,” like the one in “bobby socks,” means “to cut short,” and was previously used to describe the cropped or bobbed tail of a horse.