They are considered saints and martyrs of the Catholic church, as are all early Christians who died for the Word. Catholics revere them for their sacrifices and what they can teach us about how to live our faith. This does not detract from their Jewishness in any way. It is wrong for you to suggest otherwise. Our deep respect for the saints and martyrs is why we name our children after them instead of naming the kidlets after jewelry stores and mountains (Tiffany; Dakota).
“Tiffany,” according to most sources, is a variant of “theophany,” “revelation of God.” It was not all that unusual, in the colorful Victorian period, to find young girls named “Theophania” and known as “Fanny.”
The Tiffany family of the jewelry and decorative arts fame included a hero of the Spanish-American War.