JRRT once noted that in the tongue of Numenor of old, Radagast (it was said) meant 'tender of beasts', but in a late note 'Radagast is said to be a name deriving from the Men of the Vales of Anduin, 'not now clearly interpretable'.
My guess is that the meaning of the Quenya name Aiwendil was not in play in both cases. And sometimes it can be difficult to say if a name is intended to be a substitution or not: Gandalf and Saruman are substitutions, and Incánus might seem to be another substitution by Tolkien as the fictive translator for example, but in another late note Tolkien at least considers a possible Quenya derivation, as he had considered earlier as well.
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