Irex, found in England (mainly East Anglia)must rate as the most elusive name i have ever found.
Listed as not only a Surname but also found as a Street name and a house name.
The only Irex i can find is that of:-
Irex americanus was an old generic name applied to fish of the Carandidae family, specifically the Amberfish or Blue Runner genus but the scientific name was abandoned in the 1860's and replaced with Elagatis bipinnulatus.
Any thoughts welcome????