Related names are Santiago, Canuto, Juan, Lino, Leodoro, and Rogerio Placensia. The father of Cruz Placensia was Aniceto Placensia.
Variations on spelling: I have seen this name spelled: Plasencia, Plascencia and Placencia. I think this is still all the same family. My grandmother used to spell it Plasencia but her parents marriage certificate says Placencia. Go figure.
Keep in touch, lets see if there are any other Plasencia out there.