What is the title given to a person who executes their own will?

The title given to a person who executes their own will is "Testator." This term specifically refers to an individual who creates and signs a will, outlining how they want their assets and property distributed upon their death. The testator is responsible for ensuring that the will reflects their wishes and complies with the legal requirements of their jurisdiction.

In contrast, an executor is the person appointed to administer the estate and carry out the terms of the will after the testator's death. A benefactor typically refers to someone who gives money or gifts to help others, not necessarily in relation to wills or estates. Testatrix is the female equivalent of testator, used solely for women who create wills. Thus, in the context of this question, "Testator" is the correct designation for an individual executing their own will, regardless of gender.