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First off, mention the name again and this whole thing ends real quick. I dunno if you're dense, or doing it deliberately, but neither is an excuse.
Second, he's not mentioned by name, he's mentioned in the context of his relationship to another character. But they have the same last name, Einstein. That alone makes it a spoiler. And even if it didn't (and it does), merely finding out it's X rather than anyone else is a spoiler, even if you don't know who X is. Which you would know, because again, they have the same last name.
I can't believe I had to explain this.