If you take a hardboiled egg, scoop out the yolk and mix it with mayonnaise, mustard, salt, pepper and perhaps something spicier than the mustard, and put it back into the white part of the egg, I call it a devilled egg. I grew up in New York and moved to California, but the same term followed me to the West.
I have learned, however, that in parts of the South and the Midwest, calling them devilled eggs does not make people happy. The assumed connection to the devil is frightening to some, I suppose, even when describing picnic food. In these regions, this recipe is called stuffed eggs, filled eggs and even angel eggs.
The name deviled eggs has nothing to do with Satan. It recognizes the spiciness of the eggs. That’s all.