The saint after whom one is named; a saint whose name one has as his baptismal name or as part of it.(noun)
The Century Dictionary (Public Domain)
Use "name-saint" in a sentence
"It shows Saint Francis of Assisi the Cardinal's name-saint at the moment of receiving the signs of the Stigmata, the wounds left in Christ's body by the Crucifixion."
"He had pity and mounted me behind him on his bony animal, to which I clung the rest of the way, learning the feelings of my adopted name-saint on his gridiron."
"The most interesting point about this village is its association with its name-saint, St Brannock -- for the ancient name was Brannockstown."