Although it uses elements that we are familiar with, Zirakinbar is still an outdated form. It was eventually replaced by Zirak-zigil. Zirakinbar would have meant "silver horn" at the time it was used. Tolkien originally defined zirak as "silver", but later changed this to zigil. This, along with his decision to move away from naming all three mountains as "<something>-horn" rendered Zirakinbar obsolete. See the sections on Zirak-zigil and Udushinbar for more information.