Both Kōshirō and Tōjūrō are stage names of Kabuki actors.
Kōraiya is a name of a guild which the family of Kōshirō belongs to.
This check pattern was named Koraiya-gōshi because Kōshirō IV
played Banzuiin Chōbei(幡随院長兵衛) wearing a cape with this design
to receive a favorable reputation.
Thus this check patter was named Koraiya-gōshi and became very popular.
A wisteria patter is a part of family emblem of Tōjūrō.
Fuji(藤, wisteria) is too large for this pot and I adopted Niwa-fuji(庭藤, literally garden wisteria).