My thanks to one of the most prominent Crowley scholars for the following:
Charles Edward d'Arquires (formerly known as Randall Gair Doherty formerly known as Aleister Attaturk formerly known as Aleister Macalpine), b. 2 May 1937, Newcastle-on-Tyne, died on 20 November 2002 in Chalfont St Peter, Bucks. All of the above is from the death certificate, which has an incorrect date and year of birth (mistakenly giving 11 May 1939). His birth certificate gives the name as Randal Giair Doherty, with that odd spelling.