namecoin was supposed to do this a decade ago but never really took off. i'm not aware of anything else since then?
not dead — merge-mined by btc pools, chain never stopped, and clients like amethyst now use it for nip-05. browse it here (tor): http://6cbn4rskfdr647otej7gpqlmpqcmj723vg2eoeuu7ljbwu6cpdebozyd.onion:8080/