Santa Claus (n.) Look up Santa Claus at Dictionary.com
1773 (as St. A Claus, in "New York Gazette"), American English, from dialectal Dutch Sante Klaas, from Middle Dutch Sinter Niklaas "Saint Nicholas," bishop of Asia Minor who became a patron saint for children. Now a worldwide phenomenon (Japanese santakurosu). Father Christmas is attested from 1650s.