(compare <span class="searchmatch">Proto</span>-Germanic *Rūmō); it is possible to think of a back-formation from *rĩmьskъ, from a reflex of <span class="searchmatch">Proto</span>-Germanic *Rūmiskaz with umlaut. *<span class="searchmatch">Rĩmъ</span> m Rome...
Rúmaborg Gothic: 𐍂𐌿𐌼𐌰 (rūma) → <span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span>: *<span class="searchmatch">Rimъ</span> (likely from a Germanic language) ^ David Stifter (2009), ‘The <span class="searchmatch">Proto</span>-Germanic shift *ā>*ō and early...