This is the 9609th most frequent German word.
murillo
The word "murillo" has no meaning in German; it is likely a proper noun or a name.
The word 'Murillo' is the subject of the study in the art class, again as a proper noun representing the artist.
Wir haben Murillo in unserem Kunstkurs studiert.
We studied Murillo in our art class.
In this sentence, 'Murillo' is used as a proper noun referring to the name of the artist Bartolomé Esteban Murillo.
Murillo ist ein berühmter spanischer Maler.
Murillo is a famous Spanish painter.
Here, 'Murillo' is again a proper noun, indicating ownership of the painting created by the artist Murillo.