Pre Crisis Huntress was Helena Wayne, son of Earth-2 Batman and Catwoman. After the Crisis, since Batman was no longer an eligible bachelor, Huntress was retconned to Helena Bertinelli, the daughter of a crime family whose parents were murdered in front of her by a rival family. WHen she grew up she became basically a more violent female version of Batman.

But in "Infinite Crisis" Alex Luthor said that Helena Bertinelli would have eventually come from Earth-8 anyway, and One Year Later, Selina Kyle gives birth to a girl named Helena, who may be the New Earth incarnation of Earth-2's Huntress