That sounds like something religious. But it is not. Here in beautiful downtown Catemaco and elsewhere in Mexico, a "prestanombre" is the name of a person used to buy property in favor of someone else.
Primarily a prestanombre is used by politicians or similars to hide their ownership, but it is also used by gringos to buy properties in the 50 kilometer restricted zone of the Mexican coast.
My Popoluca is my prestanombre. Unfortunately today I met a 10 year local resident gringo who also used a prestanombre. She recently kicked him out and he is now living in a grass shack nearby.
Obviously he has no recourse because his property is in the name of a prestanombre.
So I went out and bought a box of her favorite cookies for my Popoluca.