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What do you mean by valid?
If you mean are those names found in in any text following HoME 1 and 2, then they are not.
If you mean is there anything in the forms which phonetically prevents them from being Sindarin, well I don’t see anything except possibly the final -rd in Evromord. The combination rd does not, as far as I remember, appear elsewhere in Sindarin in final position (though -nd and -ng do.) But that may only mean that final -rd is a rarity in Sindarin, not that Sindarin categorically does not allow it to exist.
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