Attested in the Dictionarium Annamiticum Lusitanum et Latinum (1651) <span class="searchmatch">rọu᷃</span> <span class="searchmatch">dĕạ</span> free Vietnamese: rộng dạ...
Old English rō, rōw, from Proto-West Germanic *<span class="searchmatch">rōu</span> (“calm, rest”). roo, rowe, <span class="searchmatch">rou</span> IPA(key): /roː/, /<span class="searchmatch">rɔu̯</span>/ ro (uncountable) Peacefulness, serenity, restfulness...