I’m not sure which Elvish language you plan to use, but I’m going to translate into Sindarin because that’s the only language I know remotely well.
By “nick” I presume you mean “nickname”. In Elvish, names cannot be abstract nouns/concepts, but with my limited knowledge of Sindarin I can offer:
- female: Fernwen (dead maiden), Ferniel (dead daughter), Gorthiel (daughter of death), Duriel (gloomy/hellish daughter), Durwen (gloomy/hellish maiden)
- male: Ferndir (dead man), Fernion (dead son), Gorthion (son of death), Durion (gloomy/hellish son), Durdir (gloomy/hellish man)
- gender neutral: Ferdhron (dead one), Durron (gloomy/hellish one)
Hope this is helpful! However, I’m not 100% certain if these are correct; if someone could double check these, that would be great!