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A counterpart is a person's equivalent in a parallel universe.
Counterparts tend to share a number of traits with other counterparts of the same person, even if they are not simply a divergent path a copy of the same person could have taken, but an inhabitant of a radically different world whose biography can only bear similarities to the original. If they do not share names across universes, counterparts will at least bear similar ones; the same goes for careers and family life.
There have been numerous cases where an individual was a counterpart of what were two different people in another universe (such as with the Darkwing Doctor, simultaneously a counterpart of Darkwing Duck and of the [Doctor].