necronym

noun3

1. •
   The name of a person who has died.

   • Some cultures have a taboo against uttering necronyms.
2. •
   A substitute name used to refer to a person who has died (instead of the name the person had in life).

   • Often a recently deceased person is referred to circumlocutory by a teknonym or necronym according to their relationship with some living [person]. — 1999
3. •
   A name or name element which indicates that someone the person was closely related to is dead.

   • An individual takes a necronym, or death-name, when some of his primary relatives die, namely a parent, a sibling, ... — 1978