It is absolutely hilarious when in Good Omens, Crowley changes her name and Aziraphale asks if she changed it to "Asmodeus", and Asmodeus being the literal demon of lust. But can we talk about that first name he said? "Mephistopheles"?
Mephistopheles is a demon in German folklore. In the Faust legend, he works as Satan's agent when Faust is selling his soul. The interpretations of this demon is what I find interesting however. Mainly that Mephistopheles HATES working for Satan, that it's basically his own hell, and even warns Faust of just how bad of an idea it is to sell his soul to the devil and that he should probably rethink his decision. Mephistopheles also never directly goes looking to corrupt people, he just kinda goes to those who already are, which included Faust, and I will repeat this again, advised him to not solidify himself as being corrupt.
Crowley kind of is this demon in a sense. They hate being a part of hell, and really the chaos they usually cause isn't as "corrupting" as the work other demons do. And yeah, they're THE Serpent of Eden, but he didn't really think knowing the difference between good and evil was something to be as severely punished as it did. As well as he was positively horrified about the drowning of all those people.
So while the scene of her changing her name is really funny because of Aziraphale's suggestion, it gives us another glimpse into the kind of demon they are. At least I think this is the reason @neil-gaiman used that name in this scene.
Also sorry if someone already posted about this and it's known, I recently just got into the fandom 😅
