(_c_) In all other languages, under the name following the prefix, with cross-references whenever the name has been commonly used in English with the prefix, as _Del Rio_, _Vandyck, Van Ess_: e.g. _Gama, Vasco da_, _Goethe, J. W. von_.
But when the name is printed as one word, entry is made under the prefix, as _Vanderhaeghen_.
(_d_) Naturalized names with prefixes are to be treated by the rules of the nation adopting them.
Thus German names preceded by _von_, when belonging to Russians, are to be entered under _Von_, as this is the Russian custom. So when Dutch names compounded with _van_ are adopted into French or English (as _Van Laun_) the _Van_ is treated as part of the family name.
Prefixes are _d', de, de La_ (the name goes under _La_ not _de_), _Des, Du, L', La, Le, Les, St, Ste_ (to be arranged as if written _Saint, Sainte_), _da, dal, dalla, dalle, dai, dagli, del, della, delle, dei_ (_dé_ or _de_), _degli, da, dos_, _das, ten, ter, thor, Van, vander, van't, ver, am, auf, auf'm, aus, aus'm, in, im, von, vom, zu, zum, zur, A', Ap, O', Fitz, Mac_ (which is to be printed as it is in the title, whether _M'_, or _Mc_, or _Mac_, but to be arranged as if written _Mac_).
Index names of capes, lakes, mountains, rivers, forts, etc., beginning with _Cape_, _Lake_, _Mt._, etc., under the word following the prefix, but when the name is itself used as a prefix, do not transpose _Cape_, etc., nor in such names as _Isle of the Woods_, _Isles of Shoals_; but there is more reason for writing _France, Isle de_; _Man, Isle of_; _Wight, Isle of_: e.g., _Cod, Cape_; _George, Lake_; _Washington, Mt._; _Moultrie, Fort_; but _Cape Breton Island_. When the name of a fort becomes the name of a city, of course the inversion must be abandoned, as _Fort Wayne_.
Forenames are to be used in the form employed by their owners, however unusual, as _Will Carleton, Sally (Pratt) McLean, Hans Droysen, Fritz Reuter_.
Give names of places in the English form. (Cross-reference from the vernacular, if necessary): e.g., _Munich_ not _Muenchen_ or _München_, _Vienna_ not _Wien_, _Austria_ not _Oesterreich_.
But if both the English and the foreign forms are used by English writers, prefer the foreign form: e.g., _Dauphiné_ rather than _Dauphiny_.