This is the 9752nd most frequent German word.
nemeth
The word "Nemeth" is not German; it is a surname of Hungarian origin. If you meant a different German word, please clarify.
Here, 'nemeth' is used as a proper noun referring to a family name.
Nemeth ist ein ungewöhnlicher Familienname.
Nemeth is an uncommon family name.
In this sentence, 'nemeth' is referred to as a specific name, presumed Hungarian.
Ich habe den Namen Nemeth in einem ungarischen Buch gesehen.
I saw the name Nemeth in a Hungarian book.
Here, 'nemeth' is used as a title and surname when addressing someone formally.