I think 'Rodnor' is just the Sindarin translation of 'Artanaro', 'high flame' or 'flame commander'. Cf. Feanaro -> Feanor and Findarato, Angarato -> Finrod, Angrod. So I suppose that if 'Rodnor' was superceded by 'Ereinion' then 'Artanaro' is obselete as well.
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