About the name... Belial is similar to the latin word Bellum/Belium.
en.m.wiktionary.org
Or even Beli-el, or it can be an anagram, Bell-ia (ya, in sanskrit is related to Vayu/Zephiros), Bell can be related to Baal or to the bell (music instrument/ vibration of a word).
The Lord of the Wind/ The Sound of the Wind/ The Wind of Baal?
He who brings the weapons towards the falsehood, he who stop every enemy of the truth to become superior and having power over us in every way (like evil over Truth), a direct manifestation of Lord Satanas in this.
The enemy in his verses talk about him as the opposite of "christ", as an arrogant one that don't submit to "christ grace", they say that he is basically Satanas, and call him the incarnation of "evil" (as he opposes jews and their teachings), and "worthless" as in their verses they try to say that Belial weapons (thorns) can't hit his enemies, and that he hides from those who call him, or something.
Winds and Thorns are related to the penetration of winds, Thorn rune is also a war rune related to penetration and destruction. The sound is related to the throat and thus to Winds, and Bel/Baal is related to him being so close to Satanas/Baalzebul.
Also my idea of him being a Warrior King with a sword can be related, as swords are related to the element Air and are war tools.
I can see some patterns.
Those who opposes the jewish teachings and "autority" are called Belial's Sons.
This is related to what I readed online, but still, this might be limitating.
We should look at Pagan Mithology, but I don't know who he is in the Pantheons.