It is possible according to canon that Elrond and Elros were names given by Maedhros and Maglor based on where they found the twins; the names they were given by Elwing and Earendil are probably lost and forgotten. So consider:
Elrond meets Elwing in post-Fourth-Age Valinor. She calls him by the name she gave him, and he does not respond to it, for he has forgotten that name.
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