I had a vague impression that Aegeon re-named the twins whom he brought up to memorialize the ones who were lost at sea, but I couldn't find this stated explicitly in the text, so maybe I'm mixing it up with Plautus.

Ah, that does make more sense. But it still doesn't answer the question of why Antipholus of Syracuse was so utterly baffled by what happened to him in Ephesus when he came to Ephesus to look for his brother. Possibly it is just that Antipholus is not the brightest bulb in the box.

And that is epic logic!fail. I will grant, my sister and I have names that rhyme, but we are six years apart and that was partly my fault because I had some input in picking out her name. ;)