St Dismas in Chapter Eleven of SM Stirling's The Sunrise Lands. In both cases, the sincerity of the appeal is admirable. However, I do not buy the continued existence either of Mary or of an originally unnamed crucifixion victim.
In earlier ages, it was important to get the name of a god, or a demon, right. Another view is that a single deity hears and responds to all prayers however formulated. My view is that an unknown recipient of all prayers is at least possible and that prayers formulate and express intentions and aspirations.