Nienhuis
Nienhuis is a Dutch toponymic surname. It is a form of Nieuwenhuis found most commonly in the provinces of Groningen and Drenthe.As of 2014, 57.6% of all known bearers of the surname Nienhuis were residents of the Netherlands, 33.4% of the United States and 5.4% of Canada.
In the Netherlands, the frequency of the surname was higher than national average in the following provinces:
;Nienhuijs / Nienhuys