Verb
To swallow up or overwhelm in, or as in, a gulf; to cast into a gulf. See Engulf.
Source: Webster's dictionaryRou is the result of a series of French regular phonetic changes from Hrólfr > Rolf > Rouf to Rou (see Lepelley 15–16) and Norman names in -ouf and -ou(t) : I(n)gouf and Ygout < Old Norse Ingulfr / Ingólfr (Old Danish Ingulf). Source: Internet