W. Va. Code § 41-1-1: Who may make will and as to what property.

Every person not prohibited by the following section may, by will, dispose of any estate to which he shall be entitled at his death, and which, if not so disposed of, would devolve upon his heirs, personal representative, or next of kin. The power hereby given shall extend to any estate, right, or interest, to which the testator may be entitled at his death, notwithstanding he may become so entitled after the execution of the will.