Maedhros, grandfather of Feanor

[Findegil]

Well yes, if you define your way of finding your truth about the facts of Middle-earth in the way you did, then the name of the father of Finwë becomes Maidros.

There is just the small problem that there are nearly as many ways to find the truth about facts in Middle-earth as there are readers of the books. And many of these way would exclude such a combination.

I will as well make a suporting argument: The repetition of names after a few generations is well known in real world genealogies and in Middle-earth (e.g. the stewards of Gondor).

Respectfully
Findegil