An artist friend of mine enlists a poet to name her work. Generally my names flow naturally, but when all else fails a husband with a gift for alliterative riffs can prove helpful. Naming a series is of greater import than an individual painting as the title must capture the purpose and meaning of a broad body of work.
To a wordsmith and storyteller, naming matters. Hopefully it leaves you with the central idea that the work is trying to convey, the essence.