Etymology: Isengard and Helms Deep

[Rune Son of Bjarne]

Originally Posted by Galadriel55

To argue the devil's advocate here, though, it is possible for an influence to appear late in the history of name changes. Going from one name to another, not hitting quite the right one, and then seeing a name that sounds like exactly the thing. Hypothetically a connection is still possible - though again, more than a simple sound-alike would be required as proof of influence, because there are simply too many sound-alikes to treat each one seriously.

While obviously Tolkien were inspired by real-life place names and history, he doesn't strike me as the kind of man to just outright copy/paste a name. I imagine him tinkering away, trying to make allsorts of linguistic ends tie together in a way that he found pleasing, but nobody else on this earth would understand the significance of (save for possibly Christopher).

Anyways, I agree it is entirely possible, but as Formendacil said it isn't necessarily the simplest explanation in this case.