The majority of people
with the last name Koolen
are born in June
and die in December
born dead
35.3% live in California
17.6% live in New York
11.8% live in New Jersey, Michigan and Nebraska
If you don't like people
called koolen
you should probably move to
New Hampshire (None live there).
Fun fact: Nebraska
is the state with the most
last name koolen per capita.
Check out the popularity
of the last name koolen
for each state in the map below.
