Here's what I think inphernals would be from if they existed irl

Sword: I think he would be from Poland

Rocket: hmm... I think that he would be from Slovakia

Medkit: he would be from Great Britain (British kit propaganda)

Subspace: he would be from Russia, specifically Siberia

Boombox: he would be from Brazil

Skateboard: he would be from New York

Coil: he would be from Romania

Vinestaff, Shuriken and Slingshot: they would be Japanese

Katana: he would be from Texas (I read his wiki now dw)

Scythe: she would be from Texas

Hyperlaser: he would be from Russia, again

Banhammer: ITALIAN (explanation coming)

The deities:

Windforce: Italian, specifically due to the fact that Splintered Skies architecture looks like old Roman architecture

Venomshank: He would be British

Illumina: Greek, look me in the eyes and tell me that this man doesn't look like some Greek God

Ghostwalker: French (French jumpscare)

Firebrand: He would be uhhhhhhhhhhhhhhhhhhhhhhhhh.... Mexican I suppose 😃

Darkheart: He would be from Montenegro

Icedagger: He would be from Greenland 🇬🇱

Feel free to flame me in the comments