W. Va. Code § 44-1-13

At the time of the qualification of an executor or administrator, the court or clerk before whom he qualifies shall require such executor or administrator to file his own affidavit, or the affidavit of some credible person, showing the names and, as far as possible, the addresses of the persons who would take any part of the estate of the decedent as heirs or distributees in cases of the intestacy of the decedent and of the persons who are devisees and legatees under the will, if any, of the decedent, and their relationship to decedent, and the clerk of the court shall record such affidavit in the fiduciary record, which affidavit and the record thereof shall be prima facie evidence of what is contained therein. The personal representative shall not receive any compensation for his services until such names and addresses be furnished by affidavit as aforesaid, unless he shows by affidavit that such heirs, distributees, devisees and legatees and their addresses are unknown to him and that after diligent inquiry he has been unable to ascertain their names and addresses.