I think it is trite that where a Testator fails to nominate a person to be his executor, any person who upon the terms of the Will has been appointed to perform the essential duties of an executor, is called as executor according to the tenor of the Will and is entitled to a grant of probate. Also where it can be implied from the Will that a person appointed a trustee is required, for instance to pay the debts of the testator, take charge of his funeral and/or generally, administer the Will, though not expressly appointed an Executor, he can be implied to be so endowed. A reasonable construction of a Will can confirm if indeed any person(s) have been appointed to perform the essential duties of an executor. This will be a clear indication that the duties which a person is asked to perform, in the absence of his being expressly named in the Will as Executor, is the determinant of his status as an executor according to tenor. See Halsbury’s Laws of England 4th Edition vol.17; Dr. Kole Abayomi SAN: Wills Law and Practice (2004) P. 129.
— J.I. Okoro, JCA. Mudasiru & Ors. v Abdullahi & Ors. (2011) – CA/L/58/2010