All the lore has indicated that, periodically, the Giants separate and Ur is de-imagined. This may, or may not, be the 12th time the Giants have come together. This may, or may not, be the 12th time Ur is de-imagined.
According to the Feats, when the Giants come back together, not everything is remembered the same, and some of the Glitchen aren't remembered at all.
I would say that, in all likelihood, each Glitchling is remembered by a specific Giant. I would love it if we could meet our Giant of choice in person, and go with them as the Giants separate and Ur is de-imagined.