The bulk update request #11872 has been approved by @evazion.
rename welt_yang -> welt_yang_(honkai_impact)
Basically, Mihoyo has Honkai: Star Rail where there's another version of Welt Yang. I've already gone through and renamed the Star Rail version of him to "Welt Yang (Honkai: Star Rail)" on here, but I realize that this makes simply "Welt Yang" an ambiguous tag of sorts.