Why is MSSQL called SQL Server?

Question

SQL Server

Why is MSSQL called SQL Server or MS SQL Server?
Other query languages ​​also work with the server.
(Google/Yandex did not provide answers)

Answer 1

Because its creators just called it Microsoft SQL Server.

Answer 2

Entering the database market, MS had to fight with Oracle - the leader in this segment. One of the fronts of this struggle was ideological, when MSSQL Server began to be called a SQL server - like, the main and only one in SQL.

Answer 3

because the trademark is registered corresponding