This is the 8048th most frequent Polish word.
niemczyk
"Niemczyk" is a Polish surname and does not have a specific meaning beyond being a family name.
In this sentence, 'Niemczyk' is used as a proper noun, presumably a surname of the individual being referred to.
Niemczyk odwiedził wczoraj swojego znajomego.
Niemczyk visited his friend yesterday.
Here, 'Niemczyk' refers to the artist who created the painting, indicating recognition or attribution.
W muzeum widziałem wspaniały obraz namalowany przez Niemczyka.
At the museum, I saw a wonderful painting created by Niemczyk.
In this case, 'Niemczyk' is used as a nickname for a person, based on their affinity for German culture.