I am starting to write a book about a half demon, that is starting to get to grips with what he is and if he wants to be good or evil any ideas on a name would appreciate any help.

Aiden
Damon
Eric
Sebastian
Adon
Alex
Kristopher
Kris
Kristian
Josiah
Zane
Jake
Matthew (this name can fit a lot of male - and sometimes female - characters ^_*)
Jordan
Kaleb (can be spelled with a C on the front)
Benjamin
Noah

It'd help if I had a description (like brown eyes, blue hair, personality), but I can still offer these names :)

Hope they help...

Well the name should have a meanin
The name should relate to the character in some way

I suggest A Weapon's name would be perfect
It can be used both for and against evil

Try these
link

P.S. My personal favourite is Tomahawk and Sai

I think that he should have a really unusual name or a normal sounding name with really weird spelling like Daemeon (almost looks like demon)

Anthony
Aaron
Rafael
Haden
Damian

Those are the names I would consider for a demon, but thats just me.