[ItsOurTimeNow]

Yes, the remnants of the people of Arnor became the Dunedain (Rangers) that protected the Shire, among other things.

Gondorians, on the other hand, became a bit more "fruitful".

At least that's how I understand it.

[Wneighbor]

That's what I was thinking. But, as I recall (fallible to be sure) when referring to the kings of Gondor they're usually referred to as being of Numemorian lineage. And when it is discussed that they intermarry with other people it's talked about as if diluting the Numenorian blood. But, with the northern kingdom, the rulers are referred to not according to their Numenorian lineage but Dunedain.