Apa the general rule to follow in alphabetizing surnames that contain articles and prepositions (e. g., ibn abdulaziz, von helmholtz) is to

Alphabetize the last names that have articles and prepositions like de, la, du, von along with the rules of the language of origin. If you know that a prefix is normally part of the surname (e. g., De Vries), treat the prefix as part of the last name and alphabetize by means of the prefix (e. g., DeBase precedes De Vries).