This is exactly why the acronym for display standards was so terrible.

The Extended Graphics Adapter (abbreviated XGA, obviously) by IBM was introduced with multiple resolutions available, named XGA and various deritives.

EGA came earlier and was colloquially used to refer to 16-color display modes, but wasn't used to define a specific resolution.

More specifically, EGA was a color palatte that had 64 colors available, 16 of which could be displayed at one time.

And then there's CGA which came prior to EGA, but like it referred to color modes rather than resolution.

Even CGA had at least a couple of different modes because you had the mode with four colors. But you also had a higher resolution mode that was just black and white. Or maybe it was black in one of the colors. I don't remember. It's been too long now. But even CJ had at least two different resolutions