aptonymy

aptonymy (uncountable)

1. The state of being an aptonym.
   • 2009, Alex Horne, Birdwatchingwatching: One Year, Two Men, Three Rules, Ten Thousand Birds, →ISBN:

     Now, I don't know whether this is an example of nominative determinism – a phrase coined by the New Scientist to describe the phenomenon of one's name determining one's career – or aptonymy, the more coincidental occurrence of one's name being particularly fitting for one's personality, but I came across several such examples in the birding world.

2. The study of aptonyms.
   • 2007, Studia Universitatis Babeș-Bolyai: Philologia - Issues 1-3, page 237:

     The aptonym has become nowadays the study object of the science called aptonymy.