The Gatherer entry for
Leyline of Singularity has the following to say:
2/1/2006 The "legend rule" causes all legendary permanents with the same name as each other to be put into their owner's graveyard. Notably, Leyline of Singularity wipes out all token creatures with the same name.
Since the tokens created by the Hunted creatures (for example) all have the same name, they would be put into the graveyard as a State-Based Effect, and then cease to exist, also as a SBE.