Eggnog may have its beginnings in the “Old World” but leave it to Americans to put a new twist on an old theme. Rum was used in the place of wine. In Colonial America, rum was commonly called “grog”, so it seems likely that the name eggnog  was derived from the very descriptive term for this drink, “egg-and-grog”, which evolved to egg’n’grog and then to the present day version of eggnog. Sounds good to me!