A plain format holding rows of values separated by commas. Simple enough to outlive every tool that reads it.
English acronym for Comma-Separated Values, a plain text format for tabular data dating to early business computing; simple enough to have outlived nearly every tool built to read it.
The name is only what it does, spelled out — commas, separation, values — with nothing hidden inside the letters. A format named this plainly needs no tool at all to be read, only eyes.