This is the 2587th most frequent Catalan word.
joaquim
"Joaquim" is a Catalan male given name, equivalent to "Joaquim" or "Joachim" in English.
In this sentence, "Joaquim" is used as a proper noun referring to a person's name.
Joaquim viu a la ciutat de Barcelona.
Joaquim lives in the city of Barcelona.
Here, "Joaquim" again functions as a proper noun identifying an individual, specifically the painter of the mentioned artwork.
Aquest quadre el va pintar Joaquim, és un artista molt talentós.
This painting was made by Joaquim; he is a very talented artist.
"Joaquim" refers to a specific person well-known by the speaker in this context.