The reason for this was that if you lived in an agrarian society then your survival was a throw of the dice every year, depending on the success of the crops. A failed crop year is a very hard year where deaths are expected. And if you grew a cereal like wheat, there were several things that could cause your crops to fail, but one of the big ones was if you happened to get a fuckton of aphids. You know what eats aphids? Ladybugs! If there are lots and lots of ladybugs around, there was a good chance that it’d be a good crop year! They were little crop protectors! When your family lives or dies on the success of that crop, of course they’d be seen as a blessing and given an appropriate name!