I don't think the names were mentioned in the Silmarillion, because I remember re-reading it and specifically looking for this information. I have not read unfinished tales so I'll take you word for it. Great to know these names. Thanks. 4 years later.
Yes or you could change them to Romestamo and Morinehtar. Also can't be exactly sure but I believe they're in the book 'The Silmarillion', just not the Quenta Silmarillion.