This is all New York data so why do you think that is?
Seems more likely that people interested in Japan related things are buying and naming these dogs, less likely that it is Japanese owners, and nobody else is choosing these?
Boxer -> Tyson
(Chocolate) labrador -> Hershey
Blue heeler -> Blue
Jack Russell terrier -> Jack
Chihuahua -> lots of Mexican names
King Charles spaniel -> Charlie
Pug -> Pugsly
Dachshund (weiner dog) -> Nathan (brand of hot dogs)
Boston terrier -> Buster (guessing this is because it's similar-sounding)
You can find the full dataset here: https://data.cityofnewyork.us/Health/NYC-Dog-Licensing-Datas...
Who made this design decision? This is awful.
For example, Houston's data is a 90MB Excel spreadsheet with more than a million rows, and includes columns like pet color and vaccination dates: