50.0% live in Hawaii
20.0% live in California
5.0% live in New York, Pennsylvania, Virginia, Ohio and Utah
If you don't like people
named ishiyama
you should probably go to
New Hampshire (None live there).
Fun fact: Hawaii
is the state with the most
last name ishiyama per capita.
Check out the popularity
of the last name ishiyama
for each state in the map below.