This is a Catalan name.
The Catalan names of the towns are in brackets.
Catalan names use i for this.
Thus, shortened Catalan names taking the first portion of the name are probably influenced by the Spanish tradition.
Colom can also be a Portuguese, French, or Catalan name, and in the latter means "dove".
Thus, the most common declension paradigm for Catalan names is the one that follows:
The Catalan name for the series is Carson i Carson advocats.
The Catalan name for the town is still the traditional one.
Joan Pau is a Catalan masculine given name.
In some cases, this was a reversion to Catalan names from decades earlier.