Makes sense to me...I found this at
http://www.celticbug.com/LadybugLore/LadybugLore.html :
"HOW THE LADYBUG GOT ITS NAME":
"There are varying legends about how the Ladybug came to be named,
but the most common (and enduring) is this:
In Europe, during the Middle Ages, swarms of insects were destroying the crops. The farmers prayed to the Virgin Mary for help. Soon thereafter the Ladybugs came, devouring the plant-destroying pests and saving the crops!
The farmers called these beautiful insects "The Beetles of Our Lady", and they eventually became popularly known as "Lady Beetles"! The red wings were
said to represent the Virgin's cloak and the black spots were symbolic of both
her joys and her sorrows."