ColossiansOne

Side by side, from the sources

Beelzebub vs Baal Hadad

One of these is descended from the other: the later figure inherits the earlier one's name, and usually very little else. Baal-Zebul, 'prince Baal', deliberately misvocalised in Hebrew as Baal-Zebub, 'lord of the flies'.

Demonic · Infernal Court · c. 400 BCE

Beelzebub

also called Baalzebub, Beelzebul, Lord of the Flies, Baal-Zebul, Ba'al Zəbûb, Baal Zebub, Ba'al Zəbûl, Baal muian, Beelzeboul, Baʿl-zabūl, Baʿal Zəvûv, Baal Zebul, Ba'al Zebul, בַּעַל זְבוּב

'Lord of the Flies' — a Philistine god of Ekron whose name was almost certainly deformed as a Hebrew insult, then inherited by Christian demonology as the second power of hell.

Alignment
Infernal
Rank
Prince
First attested
Hebrew Bible & Deuterocanon · c. 900–100 BCE
Named there as
Baal-zebub
Texts naming it
6
Powers attributed
5

Deity · Canaanite · c. 1400 BCE

Baal Hadad

also called Ba'al, Hadad, Baal-Zebul, Rider of the Clouds

The Canaanite storm and fertility god who defeats Sea and Death — and whose title, *baal* ('lord'), the Hebrew Bible turns into a generic term for false gods.

Alignment
Disputed
Rank
Storm God
First attested
The Baal Cycle (Ugaritic Tablets) · c. 1400-1200 BCE
Named there as
Ba'lu / Haddu
Texts naming it
2
Powers attributed
3

Where do they actually overlap?

Texts naming both

Powers credited to both

No shared office is recorded. Where two figures are said to be the same and share no job description at all, the identification is usually doing polemical work rather than descriptive work.

Common questions

Are Beelzebub and Baal Hadad the same figure?

One of these is descended from the other: the later figure inherits the earlier one's name, and usually very little else. Baal-Zebul, 'prince Baal', deliberately misvocalised in Hebrew as Baal-Zebub, 'lord of the flies'. ColossiansOne records the link rather than asserting the identity: where texts disagree about whether two names denote one figure, the disagreement is what gets shown.

Which is older, Beelzebub or Baal Hadad?

Baal Hadad is the older name: first attested around c. 1400 BCE, against c. 400 BCE for Beelzebub. Where the two dates are far apart, that gap is the whole reason the pair is worth comparing.

Do any texts name both Beelzebub and Baal Hadad?

Yes — 1 text names both. A single text naming both figures is the strongest evidence available here that its author treated them as distinct, whatever later writers did with the pair.