This is the 11537th most frequent German word.
steinmeier
"Steinmeier" is not a German word, but a surname, most notably associated with Frank-Walter Steinmeier, the President of Germany.
In this sentence, 'Steinmeier' is used as a proper noun, referring to the individual who holds the office of the Federal President in Germany.
Steinmeier ist der Bundespräsident von Deutschland.
Steinmeier is the Federal President of Germany.
Here, 'Steinmeier' is used as a possessive proper noun, referring to the political actions or policies associated with him.
Die Politik von Steinmeier wird oft diskutiert.
The policies of Steinmeier are often discussed.
In this example, 'Steinmeier' once again refers to the individual, highlighting their role as a speaker.