Etonian

[ ee-toh-nee-uh n ]

/ iˈtoʊ ni ən /

a person who is or has been a pupil at Eton College.

of or relating to Eton College.

Origin of Etonian

First recorded in 1740–50; Eton + -ian

But, as an old Etonian, even one who left in disgrace, I doubt it.

Thank God I Was Kicked Out of Eton, Not Harrow |Tom Sykes |September 6, 2013 |DAILY BEAST
She is dating Alex Loudon, a 30-year-old Old Etonian and former England cricketer.

Pippa Middleton, the Royal Wedding's Other Star |Tom Sykes |April 29, 2011 |DAILY BEAST
The scholarship had been won by a precocious Etonian with an extraordinary talent for 'stems' and all that appertaineth thereto.

Robert Elsmere |Mrs. Humphry Ward
"He is first-class," the lieutenant, who was an old Etonian, said.

The Dash for Khartoum |George Alfred Henty

He was a freshman, an Etonian, a "Gourmet" and a member of the Bullingdon.

Sonia Between two Worlds |Stephen McKenna
Frank's epistle was to the same purport, only more Etonian and less legible.

The International Monthly, Volume 2, No. 4, March, 1851 |Various
"The cooking is fifty times better at old Birch's," the young Etonian growled.

Salome |Emma Marshall

Etonian

/ (iːˈtəʊnɪən) /

a pupil of Eton College

of or relating to Eton College