If Denethor hadn't committed suicide

[Inziladun]

Originally Posted by Pitchwife

To get back on topic (well, sort offish), the very fact that Aragorn gave himself an Elvish name like Thorongil would be an indicator not only of Númenorean, but of Gondorian or Arnorian descent, - in my knowledge, no other Mannish people used the Elven tongues in naming; certainly not the Black Númenoreans, who, being descended from the King's Men, had abandoned the Elven languages for Adûnaic back before the Drowning.

Ah, but was Thorongil the name he gave himself, or a name that was applied to him by others?

In much that [Ecthelion] did he had the aid and advice of a great captain whom he loved above all. Thorongil men called him in Gondor, the Eagle of the Star, for he was swift and keen-eyed, and wore a silver star upon his cloak; but no one knew his true name nor in what land he was born.

ROTK Appendix A

That gives the impression he was given the name 'Thorongil' as a reflection of men's observations about him. They had to call him something, after all.

I don't recall any mention of whether he was called Thorongil in Rohan.