[Galin]

We could have a scenario similar to this: "( . . . ) it was then still the custom for the father-name of a son to be a modification of the father's name (as Finwe/Curufinwe) or a patronymic (as Finwion "son of Finwe")." So Curufinwe wants his son's names to have Finwe in it.

Nelyafinwe -- straightforward enough "Third Finwe" . . . but note too, that every Father-name has a short form to go with it:

Nelyo,
Cáno,
Turco,
Curvo
and so on . . .

. . . and did Cáno (Maglor) have a "strong voice" as a baby? Or did Turco have a powerful grip? It's noted that Moryo was black-haired as his grandfather. In other words, even without the help of foresight, to me, these names seem quite possible as being based on observable things from birth.

Not that all names need be, of course. I can imagine some fathers liking a name "strong in body" for a son, whether the son turns out to be notably strong in body, or not.

Or a daughter!