da, de, d', du, la, van, von

Capitalization of particles such as de, du, la, von, etc., varies, depending on the preference of the individual.  If this cannot be ascertained, lowercase the particle (except for La, Le, Les in French names) with the full name or surname only except at the beginning of a sentence.

Do not allow a line break to separate the particle from the surname that follows. Occasionally the particle is dropped entirely.

In some cases the particle is dropped when the surname is used alone:

          Paul von Hindenburg, Hindenburg