You can check the following links for references.
('Saint Nicholas') is a traditional winter holiday figure celebrated in various regions of Europe, including: the Netherlands, Belgium and Luxembourg, some parts of Germany and Austria, (Sankt Nikolaus); Switzerland (Samichlaus), Italy (San Nicola in Bari, South Tyrol, Alpine municipalities, and many others), French Flanders, Lorraine and Artois, the Balkans, Greece. Other names for the figure include De Sint ('The Saint'), or more formally Sint Nicolaas or Sint Nikolaas; Saint-Nicolas in French; Sankt Nikolaus in German, also known as De Goedheiligman ('The Good Holy Man')
He is one of the sources of the holiday figure of Santa Claus in North America.
Saint Nicholas (Wikipedia)
I think after reading these references, your doubt will be cleared forever :)