The entire world calls him Santa Claus!

The story of 'Saint Nicholas'
In the fourth century, lived a Bishop named St. Nicholas in Myra, now known as Turkey. He was very rich as his parents died at a young age, leaving abundant of wealth behind. St. Nicholas was a generous man who is well-known for helping the poor as well as giving others secret gifts.

The old man later discovered it was St. Nicholas, who helped him and the news soon spread out. Since then, whenever someone receives secret gifts, it was thought that it might be from St. Nicholas himself.
During his time, St. Nicholas was seen wearing robes with a wide range of colours. But, red was his favourite!

One of the early illustrations of St. Nicholas was drawn by Thomas Nast and in 1881, Harper's Weekly published his famous image of Santa with a big red belly, an arm full of toys and smoking a pipe!
St. Nicholas Day is celebrated on 6th December, yet he is also seen as Santa Claus who delivers gifts to children on Christmas eve. But the story of Saint Nicholas is not the only one around! There are also a few other versions of Santa Claus, such as UK's Father Christmas, Dutch's Sinterklaas, Finland Joulupukki and German's God Wodan.

Source: Why Christmas & Wikipedia
Photo Credit: In the Swan's Shadow, Orthodox Christian Network, The Art of Simple, St. Nicholas and the three daughters, Jelly Telly, Welcome to Yorkshire