Mr. Owens is the alias of Justice Wargrave. It is used by Issac Morris to buy Soldier Island, and used to invite many of the guests.
The other names of Mr. Owens is U.N.O, and U.N. Owen. It is a reference to Unknown.
See Justice Wargrave and Issac Morris for more.
Also, my name, ShuffleUno, has nothing to do with this.