Saint Nicholas was not Dutch.
Here is a good website to learn about the origin of what is not seen as Santa Claus, http://www.stnicholascenter.org/Brix?pageID=38
The true story of Santa Claus begins with Nicholas, who was born during the third century in Patara, a village in what is now Turkey. His wealthy parents, who raised him to be a devout Christian, died in an epidemic while Nicholas was still young. Obeying Jesus' words to "sell what you own and give the money to the poor," Nicholas used his whole inheritance to assist the needy, the sick, and the suffering. He dedicated his life to serving God and was made Bishop of Myra while still a young man. Bishop Nicholas became known throughout the land for his generosity to the those in need, his love for children, and his concern for sailors and ships.
The Dutch did bring Santa Claus to the Americas, they called him Sinter Claus.