A great subject ~ I looked up a few blade and gun combinations as below and at
https://en.wikipedia.org/wiki/Pistol_sword
The weapon with the axe is Polish.
The stiletto dagger combination is German
The One with the duck motif is Belgian.
There are some interesting references and one book looked especially inviting I thought..
BLADES AND BARRELS
six centuries of combination weapons
by H. GORDON FROST.