Definitions of warner:

• noun:   someone who gives a warning to others
• noun:   United States filmmaker who with his brothers founded the movie studio that produced the first talking picture (1881-1958)
• name:  A surname (common: 1 in 3225 families; popularity rank in the U.S.: #344)
• name:  A male given name (rare: 1 in 25000 males; popularity rank in the U.S.: #1136)