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[–] 5 points 2 weeks ago (1 child)

If you are referring to only one of the two, it is "their name is Trevor". If you are introducing both of them at once (possible, but less likely), you would say "(both of) their names are Trevor". Sometimes people also pluralise the name, e.g. "I'm friends with five Alices" or "I know two Bobs at work"

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