Superman is often touted as the "Last Son of Krypton," but that's just all the way not true. (Unless they mean "Final Son of Krypton," as in the last child to be born on the planet, which is an interesting description). But Supergirl, Superboy (in some incarnations), Powergirl, Zod, Zod's crew, that yellow couple from All-Star Superman, and the ENTIRE population of Kandor also survived the planet's destruction.

Kal-El is hardly "the last of his kind."

Obviously some of these characters are from different continuities or dimensions or canons, but overall, is there a general headcount of how many Kryptonians survived the destruction of their planet? And has any story featured these survivors trying to band together and re-found Kryptonian civilization? It seems like, in some versions of the story at least, there would be enough people to make a decent attempt at a "survivor colony."