This is a picture showing the appearence of name-bearers "Buiter" in The Netherlands for the year 1947. The numbers in the provinces tell the percentages of the total number of 512 bearers that live in that province.
As you can see, most Buiter's live in Groningen. My forebears come from Drenthe; the second most populated province with Buiter's.

Picture of the census 1947