aptonymy

noun

1. The state of being an aptonym.“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.“The aptonym has become nowadays the study object of the science called aptonymy.”