I list people by name and email when I first encounter them, so I can find them with search later.
Important people get a page, and I name the file “Lastname, Firstname profession”, and save them in a People folder. That way, I can search that folder by name or profession (sales, UX, dev, doctor, etc.). And if I have several John Smiths, the profession helps disambiguate.
In daily and meeting notes, I link whoever’s there, so it’s easy to use backlinks on a person note to see when that meeting was or when I saw that doctor.
My Person template is super simple, but 8 include a default description block at the top with ^1 at the end, so I can embed a brief description of one anywhere:
Smith, John UX: Product designer at Facebook. Met at SXSW in 2021 when he was at Goolge. ^1
The standard block reference code makes it super easy to embed overviews like that. (I use the same hack for day, week, months, projects, and glossary terms.)