Many place names of Nishimikawa beginning with Ozaki, have been transposed to locations in Edo (For example, "Akihabara" was a name for a country bordering Mikawa, which originaltes from the Akihayama Motomiyaakiha Shrine of the former country of Totoumi.), because Ieyasu TOKUGAWA was originally the daimyo of Mikawa Province (present-day Okazaki City of Aichi Prefecture in Western Japan.).
元々、徳川家康自身が岡崎市出身の一大名であったように、岡崎を初めとする西三河系の地名が、江戸には多く移植されている（例：秋葉原三河の隣国、遠江国の秋葉山本宮秋葉神社に由来）。