How to write "von" as part of family names, especially at the beginning of a sentence

Question

How do you write "von" properly? Do you write it with capitalised v if you write von in the beginning of sentence? Which one is correct, "von Brun" or "Von Brun" if you want to write it as name lets say on a note or a memo?

Answer 1

1. The first letter of any sentence is capitalised.

2. Alle zu einem mehrteiligen Namen gehörenden Adjektive, Partizipien, Pronomen und Zahlwörter schreibt man groß <§ 60>.

   prepositions and articles are written as you usually write them: Johann Wolfgang von Goethe, der Schiefe Turm von Pisa, Lutz van der Horst

Answer 2

Von is written von everywhere except where a capital letter is required by the normal capitalization rules, for example at the beginning of this sentence

Answer 3

According to Duden, the Adelsprädikat, if spelt out, is written as “Von” at the beginning of a sentence, but if it is abbreviated then it is always “v.” even at the beginning of a sentence.

See this: https://gfds.de/kleinschreibung-am-satzanfang/