I notice you might have missed the Master mentioning Tamayo (the demon doctor that Tanjiro is getting blood samples for). It seems the Master knows Tamayo somehow.
Jonathan Speziale
2022-08-13 20:00:24 +0000 UTC
From what Ive seen watching anime, people usually say the "last name" before the "first name" (for example the Master says Tomioka Giyu or Kibutsuji Muzan). The since the subs are in English, it shows the phrasing that we are used to (Giyu and Muzan are the first names). Kinda confusing I know