Yes, the question seems to be whether Oarni/Earni is Quenya or Sindarin.
I had assumed that "Oarni" was Qenya. It certainly
looks more like Qenya than Gnomish. And though I don't have the Qenya Lexicon, in the
index to the Qenya Lexicon I find "oar (n-)". So I think we can safely guess that it is Qenya.
I don't see any reason to change it to Sindarin, despite the possibility that that would allow us to retain "oar" rather than "ear". So I vote for a change to "Earni".