Starved fish at times come to look at classifications. At times we might let our imagination get the better of us. If I need to give a name for something I can't describe to you, I might reach for a book that nobody reads, but we can also recycle myths. We must note that what comes first means that what comes last is the removing of things that might be called unnecessary. In the middle we find that to prevent our toes getting cold while nonetheless being efficient about it, mixing names from mythology is no different from mixing alphabets.
Which is just one of those things that happens. Madonna is easiest to picture when we don't have to consider the strict application of law, and so we come to look at Miss Piggy instead.