A name for a character who is a demon?

In a story I'm writing, I need a name for a demon. His alias is "Mr Smith" or "John Smith" (because he isn't very good at naming things/people/etc.)

Any help would be appreciated. Thanks!

Ooh, I'm not too good at names myself, but I do know this awesome name generator:
http://www.fantasynamegenerators.com/
It's got names for LITERALLY EVERYTHING! And if you don't like any, you can usually use the generated names as a jumping-off point.
Hope you like it!!

Thankyou!!

Lucifer or something Satan related

Well, before I saw that your character in question was a male, I would have suggested Mrs. Dodds.

I'm sorry but I had to

Chernobog is a really cool name. He was the Slavic god of darkness, evil, and grief.

Aeshma is the Zoroastrian demon or wrath and fury. I've used him in a couple stories.
There's always Faust, Claude, and Sebastian. They're a bit overused, though.
Asmodeus
Allocer
Aamon
Barbatos
Morax
Beezlebub, and variations thereof
Abaddon
Crowley is a fan favorite, appearing in the show 'Supernatural' and 'Good Omens'
Astaros
Go through some Wikipedia page on demonology, and you'll find good names

Crodden

Fantasynamegenrators.com is a really helpful website and has names for almost everything

Bartholemew.

Arachne
Diablo
Lilith
Ambrosia
Astrid
Aiden
Edwin

Xerxes was the name of a Persian king and to me the name sounds very demon-like.

maybe go with one already established, there are many demonic entities in lore any mythology through out the world, maybe just make your character your own interpretation of one of those. one of my personal favorites to read his mythology is Bael. there's about a thousand established demons you could choose from for this idea

desemis or asayzal

Daemon

You can use Seth. Seth is the Egyptian god of chaos, war and storms.

Ayomi

Dean