Board Thread:Suggestions forum/@comment-26949898-20170607140255/@comment-26149161-20170607203339

It appears to be a mix of both of our ideas. The Sindar of the East definitely took Silvan style names and customs, as below:

"Oropher had come among them with only a handful of Sindar, and they were soon merged with the Silvan Elves, adopting their language and taking names of Silvan form and style. "

However, I have found that the Elves of Mirkwood and Lorien began to speak a heavily accented Sindarin before Silvan Elvish, which led to the decline of the language.

As for the Dorwinrim, they were likely a mix of a few Silvan Elves, Penni Avari, and probably another Avarin tribe. It is unlikely they would speak Sindarin.

Ithilion, Discussions Moderator (Auta i lómë) 20:33, June 7, 2017 (UTC)