...or vague coincidence?
Wikipedia had this to say about the River Nar:
The River Nar is a river in England, and tributary of the River Great Ouse. It rises near Litcham in Norfolk and flows 15 miles west through Castle Acre and Narborough (the latter giving the Nar its name), joining the Ouse at King's Lynn. It has had a variety of alternative names, such as the Setch, the Sandringham, and Lynn Flu, though these are rarely, if ever, used today.
In case you don't know what relevance this has on Marathon's story, the Nar are an alien race only mentioned in terminals and shown in one piece of terminal art (Curiouser and Curiouser..., Terminal 1).
Maybe Jason Jones had Trivial Pursuit - UK Edition? ;)