Concise AACR2:  34. Entry under surname

34A. General rule

Enter a name containing a surname or consisting of a surname under the surname unless the name is to be entered under a title of nobility (see rule 35).

34B. Part of the name treated as a surname

If the name does not contain a surname but contains an element that identifies the person and functions as a surname, enter under that element.

34C. Compound surnames

34C1. Preliminary rule.

Apply the following subrules to names that contain, or appear to contain, compound surnames (those consisting of two or more proper names). Apply the subrules in the order in which they appear.

34C2. Hyphenated surnames.

If the parts of the compound surname are usually or sometimes hyphenated, enter under the first element of the compound surname.

34C3. Unhyphenated surnames. Some married women.

Apply this rule to the names of married women with unhyphenated surnames consisting of the surname before marriage and the husband's surname.
Enter under the first element of the surname if the woman’s language is Czech, French, Hungarian, Italian, or Spanish.
Enter under the husband’s surname if the woman's language is other than those listed above.

34C4. Unhyphenated surnames. Others.

Enter under the first element of the compound surname unless the person's language is Portuguese.

34C5. Nature of surname uncertain.

If the name appears to contain a compound surname but you are not sure:
  1. enter under the last part of the name if the person's language is English or one of the Scandinavian languages
  2. enter under the first part of the apparent compound surname if the person's language is neither English nor one of the Scandinavian languages.

34D. Surnames with separately written prefixes

34D1. Articles and prepositions.

If the surname includes an article (for example, le) or preposition (for example, van) or a combination of the two (for example, de la, della), enter under the part of the surname that is most commonly used as the entry element in listings in the person's language or country of residence. See the list of languages and language groups below. For languages not included in this list, see the full AACR2.
If a person has used two or more languages, enter the name according to (in order of perference):
  1. the rule for the language of most of his or her works
  2. the rule for English (if English is one of the languages)
  3. the rule for the language of the country of his or her residence
  4. the rule for the language of the name.

Languages and language groups

ENGLISH
Enter under the prefix.
FRENCH
If the prefix consists of an article (for example, le) or of a contraction of an article and a preposition (for example, du), enter under the prefix. Otherwise enter under the part of the name following the preposition.
GERMAN.
If the prefix consists of an article or of a contraction of an article and a preposition (for example, Vom), enter under the prefix. Otherwise, enter under the part of the name following the prefix.
ITALIAN.
Enter a modern name under the prefix. For mediaeval and early modern names, see the full AACR2.
SPANISH.
If the prefix consists of an article only, enter under it. Enter all other names under the part following the prefix.

34D2.

If the prefix is not an article, or preposition, or a combination of the two, enter under the prefix.

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