wouldn't it be THOR?
https://www.av1611.org/othpubls/santa.html
Even today in Sweden, Thor represents Santa Claus. The book, The Story of the Christmas Symbols, records:
Swedish children wait eagerly for Jultomten, a gnome whose sleigh is drawn by the Julbocker, the goats of the thunder god Thor. With his red suit and cap, and a bulging sack on his back, he looks much like the American Santa Claus. (Barth, Edna. Holly, Reindeer, and Colored Lights, The Story of the Christmas Symbols. New York: Clarion Books, 1971, p. 49)
Thor was probably history’s most celebrated and worshipped pagan god. His widespread influence is particularly obvious in the fifth day of the week, which is named after him – Thursday (a.k.a. Thor’s Day).
It is ironic that Thor’s symbol was a hammer. A hammer is also the symbolic tool of the carpenter – Santa Claus. It is also worth mentioning that Thor’s helpers were elves and like Santa’s elves, Thor’s elves were skilled craftsman. It was the elves who created Thor’s magic hammer.
In the Handbook of Christian Feasts and Customs, author Francis Weiser traces the origin of Santa to Thor: "Behind the name Santa Claus actually stands the figure of the pagan Germanic god Thor." (Weiser, Francis X. Handbook of Christian Feasts and Customs. New York: Harcourt, Brace & World, Inc., 1952, p. 113