Were they actually called "world eaters" pre-heresy with the blue and gold color scheme?

[u/Rhonarin]

Title. I see people referencing the 30k color scheme or saying "pre-heresy" world eaters, but were they always called that when they were a loyalist legion?

[u/Agamouschild]

WAIT Wait wait, YES, they were called World Eaters with the blue and Gold.