The procedure here (dahil-i dava) appears to be that of adding a defendant, and such a defendant is known as an added defendant.

Example of use:

"NOTICE TO ADDED DEFENDANT
An action has been commenced by the plaintiff for the foreclosure (or sale) of the
mortgaged property described in the attached schedule. I have been directed by the judgment in this action dated (date) (where the judgment is for sale, insert: to conduct a sale of the property and) to inquire whether any person other than the plaintiff has a lien, charge or encumbrance on the property subsequent to the plaintiff’s claim or whether any other person has an interest in the property. It appears that you may have an interest in the property. I have therefore added you as a defendant in this action. A copy of my order and the judgment in the action are attached to this notice."

http://www.gov.pe.ca/courts/supreme/forms/F-64Q.pdf