[bmn__]

I feel it's unlikely that this the explanation for what GGP had in mind. I postulate that names characters usually have no variants, thus do not undergo unification, or where there are variants, they are already encoded as Z variants, so the contention is also moot.

Prove me wrong with a counter-example.

[SAI_Peregrinus]

https://soranews24.com/2014/02/13/japanese-woman-celebrates-...

First search result.

[bmn__]

𫟈 is U+2B7C8 "CJK Unified Ideo­graph- 2B7C8". 𛁻 is U+1B07B "Hentaigana Letter To-5".

Both character fall into the first category I mentioned, no variants.