Aliasing Giegue → Giygas
Link to alias

Reason:

They're the same character, the two names are merely different translations of the Japanese "Gyīgu". And as you can see, they're typically both being tagged to the same posts. Which seems a bit useless.

So which of the two tags should it be? Well, considering Giegue hasn't ever been an official name (because the original Mother's NES translation "Earth Bound" was finished but never actually released to the public), I say we should stick to Giygas. That just seems to be the sensible thing.

Some people have taken to calling his physical form Giegue and his non-corporeal form Giygas.

But they are the same character.

Ko-san said:
Some people have taken to calling his physical form Giegue and his non-corporeal form Giygas.

But they are the same character.

I know that of course, but that idea doesn't really reflect on here given that both Alien-Giygas and Fucked-Up-Evil-Spirit-Giygas consistently get both tags.

Giygas is the official NoA name for him. Done.