French for "street," from Vulgar Latin *ruga (source also of Old Italian ruga, Spanish rua "street in a village"), from Latin ruga, properly "a furrow," then in Medieval Latin "a path, street," (see rugae).

"sorrow, repentance," Old English hreow "grief, repentance, sorrow, regret, penitence," from Proto-Germanic *hrewwo "pain; sadness, regret, repentance" (source also of Frisian rou, Middle Dutch rou, Dutch rouw, Old High German (h)riuwa, German reue), related to the root of rue (v.).