That's too complicated for me!

I don't know who named them but there's a slightly easier way than that site gives, for finding the modes (without understanding the intervals), just using the white notes on a piano!

1. Starting from C, play all the white notes to the next C. That's a major scale, known as the Ionian mode.

2. Start from G, stick to the white notes and go up to the next G. That's the Mixolydian mode.

3. Now go back to D and do the same thing. That's the Dorian mode.

4. Up to A, a scale on the white notes and you have the Aeolian mode.

Those are the main modes used by folkies. You can do the same thing starting from E, from B and from F but they're pretty weird and not often used.

Everybody uses Ionian, lots of folk songs are in Mixolydian, and there are quite a few in Dorian and Aeolian so it's worth spending some time with a piano, getting to understand the feel/sound of modes.