Never thought about it. Could it have something to do with the Common Tongue, where the "-rim" ending is only kept as an exception, in imitation of Elvish (or at least the Gondorian dialect)? Perhaps it was Gondorrim and Numenorrim when spoken in their language.
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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