for me it really varies, especially between original works and fanworks.

with original works i tend to name it after something involved in the setting; Project Eternia (a video game taking place in the world called Eternia), The World Within (name of a bar that one of the characters owns/lives in). Though there was one piece i wrote for a college class that took place in the TWW universe, and I named it 'so an android sneaks into a company party' or something similar which lines more up with my fanworks naming conventions.

meanwhile with fanworks i tend to be a bit more verbose but have names that kind of get the vibe of the story (if that makes sense?); Sins of the Fathers, Grace of the Sons (story about two sons feeling they have to fix the failures of their fathers), The Other Side Looks The GD Same (the two main characters think that the other character is dead, keep doing what they feel they need to to stop the bad guys from the 'other' side, so it's a play on words of the meaning), A Life Through Blue-Green Eyes (semi slice of life story from the perspective of a character with heterochromia).

but i also was told by my writing teacher back in highschool that i was not good at naming my writing pieces so your milage may vary.