WHY IS HE ADDING “-YA”?

D: Like “Mugiwara-ya”, Law-san tends to call people with the “-ya” suffix, but in the case where the person’s last name is “Tsuchiya”, then does that become “Tsuchiya-ya”? Please tell me Law-san♡ P.N. HeartLoveWoman

O: Mr. Law—they’re calling you –! …………. Aw he won’t come-. Let me answer instead. A long time ago, around maybe the Edo period–. There was this thing called “Yagō”. So if for instance, in the case where there were two Mr. commoners named “Tomekichi-san”, things like “Dōgu-ya no Tomekichi” (Tomekichi of the Tool shop) or “Oke-ya no Tomekichi” (Tomekichi of the Bathtub maker); something with “~ya” would be used in place of a last name-. Like how you shout “Tamaya~” at the fireworks or “Nakamuraya” from Kabuki; have you heard of those? In other words, he just goes with the flow. Right, Law-san?