Why is Jack Nicklaus’ nickname “The Golden Bear”?

Jack Nicklaus was given his nickname by Australian sportswriter Don Lawrence who wrote an article about Jack Nicklaus arriving in Australia in 1961. The headline was: “Golden Bear from U.S. to Arrive Today”.

More about The Golden Bear

Also, the high school Nicklaus went to was the Upper Arlington Golden Bears.

"Well, I’ve been a Golden Bear all my life. I might as well continue to be a Golden Bear." - Jack Nicklaus said.

How many Majors has Jack Nicklaus won?