Proton was started from a Timeplus's internal projects which all named after particle.

Yes, it lacks context, but can you get the context from Flink or Spark ? both of these are just data processing tools, supporting streaming as well.

How about "Timeplus Proton"? Yes, I know there are good game engine and mail service with that name. At Timeplus, component is named after the particles, e.g. https://github.com/timeplus-io/chameleon, our data generator