Isabell
In English, proper nouns (Eigennamen) and words derived from them are always capitalized:
A proper noun is a noun that in its primary application refers to a unique entity, such as London, Jupiter, Sarah, or Microsoft, as distinguished from a common noun, which usually refers to a class of entities (city, planet, person, corporation), or non-unique instances of a specific class (a city, another planet, these persons, our corporation). [...]
In English and many other languages, proper names and words derived from them are associated with capitalization
