Wildly, the Polish word "nagle" (pronounced differently) means "suddenly" or "all at once", which is just astonishingly apropos for what I'm almost certain is pure coincidence.
Yeah, it's named after the person who wrote the RFC - John Nagle. Wild coincidence! https://datatracker.ietf.org/doc/html/rfc896
Strangely, the Polish word seems to encode a superposition of both settings: with NODELAY on, TCP sends messages suddenly, whereas with NODELAY off it sends tiny messages all at once, in one TCP packet.