Who is lucifer???

when isiah(sp) refers to lucifer is he really refering to satan??? seeing how the name lucifer only apperars in the bible once and that is in isiah(sp) is he really refering to satan or is he really refering to a babolonian king that ruled during his time that help a name quit similar to lucifer except to a few leters??? and here is a real brain thumper. jesus refers to himself as the light bearer if you look up the name lucifer or the word lucifer it translates roughly to the bearer of light so is jesus saying that he himself is lucifer??? think about it.