Why is the London police facility called Scotland Yard?

Scotland Yard is often used as a metonym for the Metropolitan Police Service of London, UK. It derives from the location of the original Metropolitan Police headquarters at 4 Whitehall Place, which had a rear entrance on a street called Great Scotland Yard.[1] The Scotland Yard entrance became the public entrance to the police station. Over time, the street and the Metropolitan Police became synonymous. The New York Times wrote in 1964 that, just as Wall Street gave its name to the New York financial world, Scotland Yard did the same for police activity in London.[2] Although the Metropolitan Police moved away from Scotland Yard in 1890, the name New Scotland Yard was adopted for the new headquarters

((Dan))

Because the name of the street the original facility was located on was Whitehall Place and the back entrance was on a street called Great Scotland Yard. The Scotland Yard entrance became the main entrance for the public and as such that was what the facility got to be known as by the public. The name has just stuck.

The back door of the original building for the Metropolitan (London) Police HQ let out on to a street called Great Scotland Yard.

Later that door became the public entrance.

When, around 1890, they built a new HQ in a different location they kept the popular nickname and called it New Scotland Yard

It because of the piece of property that it is located on...

Nobody actually knows its so old theres a few theories try google.