Theory One of the 12 supreme grade swords belongs to a giant of elbaf

[Monkey D Theories]

Elbaf is stated to be a land of war

Spoiler

Hence imo one of the supreme grade swords had to have come from elbaf. We know Wano at the very least produced one supreme grade, the shodai kitetsu.

I feel like elbaf will have one as well.

 

[Yoho]

Highly possible maybe Loki has it

 

[CaeDBoyd]

Probably some random giant who crafted the sword with the creater of the shodai ketsu