Probably not, a behelit is just that, a charm of some kind that used often by pagans and dipshits of all sorts... The band u refer to has no relevance to Berserk... Thats all ;)
I think "Beherit" means "devil" and "Behelit" means nothing (or probably the japs are trying to say "beherit" but they are always changing "l"s into "r"s and vice-versa)